Fostering consumer engagement with marketer-generated content: the role of content-generating devices and content features

Purpose – This research explores the impacts of content-generating devices (mobile phones versus personal computers) and content features (social content and achievement content) on consumer engagement with marketer-generated content (MGC) on social media. It also examines these factors ’ interaction effects on consumer engagement. Design/methodology/approach – The study analyzed MGC that 210 companies had posted to Sina Weibo over three years, testing the study ’ s proposed model with negative binomial regression analysis. Findings – The study ’ s results show that MGC generated via mobile phones attracts more consumer engagement than MGC generated via personal computers. MGC with more social features attracts more consumer engagement, whereas MGC with more achievement features reduces consumer engagement. The authors also found that MGC with more social features generated via mobile phones and MGC with more achievement features generated via personal computers lead to more consumer engagement due to the congruency of the construal level of psychological distance. Originality/value – This research enriches the literature by exploring the effects of content-generating devices and content features on consumer engagement in the MGC context, which extends the research on consumer engagement with social media from the context of user-generated content to the MGC.


Introduction
Because of its persuasiveness, social media has been widely used to foster consumer engagement (Lee et al., 2018;McShane et al., 2021;Pezzuti et al., 2021). Marketer-generated content (MGC) has been regarded as a critical factor that can help firms maintain competitive advantages in volatile markets by enhancing consumer engagement and increasing revenue and consumer retention (Lee et al., 2018;Meire et al., 2019;Weiger et al., 2019). Moreover, marketers invest in MGC on social media to encourage consumer engagement (such as comments, likes or sharing) (Chandrasekaran et al., 2019). By consumer engagement, we mean interactions between consumers and brands through MGC generated via mobile devices or personal computers (PCs) (Meire et al., 2019).
Smartphones' extensive use has dramatically changed individuals' approaches to content generation and communication. People have shifted away from their reliance on PCs and toward mobile devices because of their convenience (Lee et al., 2020). Social media platforms also allow consumers to learn which device has been used to generate social media content since both user-generated content (UGC) and MGC can display such information through icons. Previous research has shown that device types used in generating UGC can affect consumers' perception of and behavior toward UGC (Grewal and Stephen, 2019;Ransbotham et al., 2019). For example, in terms of content features, UGC generated with mobile devices differs from UGC generated via PCs (Zhu et al., 2020). Moreover, consumers perceive UGC generated through mobile devices as more credible than PC-generated UGC (Grewal and Stephen, 2019). However, prior literature has mainly focused on examining the impact of device types on consumer perceptions and behaviors in the UGC context. By contrast, little is known about the MGC context. Specifically, previous research has rarely examined how device types applied in generating MGC affect consumer engagement with MGC. An understanding of how MGC-generating device types (mobile phones versus PCs) affect consumer engagement with MGC could offer new insights into social media marketing.
Apart from device types, MGC content features have been suggested as another crucial factor affecting consumer engagement with MGC (Cruz et al., 2017;McShane et al., 2021). People respond differently to information with different features Li et al., 2018;Lin et al., 2020;Zha et al., 2021;Zhang et al., 2019). Marketers could use more specific words in MGC to reinforce the information they want to express through MGC (Han and Lind, 2017;Tausczik and Pennebaker, 2010). Various MGC content features have been argued to promote consumer engagement, such as textual expressions of certainty (Pezzuti et al., 2021), second-person pronouns in a text (Cruz et al., 2017) and emojis in MGC (McShane et al., 2021). Additionally, information that describes a brand's achievements can help consumers understand the brand's value and appealing backstory (Urde and Greyser, 2015). Marketers have also used more social or achievement-based words in MGC on social media to better convey their intended meaning, aiming to foster consumer engagement (Lv et al., 2021).
The literature has shown that consumer engagement can attract more consumers, increase positive electronic word-of-mouth (eWOM) and consumer loyalty and enhance economic performance (Bapna et al., 2018;Chen et al., 2020;Pezzuti et al., 2021;Ray et al., 2014;Zhang et al., 2020a, b). Consumer engagement has even been argued to drive firms' long-term success (Gopalakrishna et al., 2019). It is meaningful to understand whether applying social and achievement content to MGC can foster consumer engagement, which brings benefit to firms. Therefore, an understanding of how social and achievement features of MGC influence consumer engagement with MGC is needed. However, research has seldom investigated whether MGC's social and achievement features can affect consumer engagement with MGC.
According to construal-level theory (CLT) , psychological distancedefined as a "subjective experience that something is close or far away from the self"has a bidirectional relationship with individuals' construal levels (Trope and Liberman, 2010, p. 440). On the one hand, psychological distance determines whether individuals construct an event at a high-level construal or a low-level construal . On the other hand, when events are constructed using high-level construal terms, their psychological distance could be increased; in contrast, psychological distance is closer to events constructed using low-level construal terms . For instance, people feel closerboth spatially and temporallyto mobile phones than PCs in their daily lives (Melumad and Pham, 2020). Content that expresses social features makes people feel more lifelike, involving a low-level construal (Tausczik and Pennebaker, 2010). Conversely, content that expresses achievement features is more abstract, emphasizing superordinate central features and leading to a high-level construal (Tausczik and Pennebaker, 2010).
Per CLT, MGC with social and achievement features affects consumers' psychological distance in two directions, potentially influencing their interactions with the MGC. Specifically, MGC with social features may promote consumer engagement with the MGC, whereas MGC with achievement features may reduce consumer engagement. Prior research on the congruency effect suggests that matching the psychological distance associated with MGC content features with an appropriate construal level for an MGC-generating device could improve consumer engagement. However, research has seldom explored how such matching affects consumer engagement with MGC from the CLT perspective of psychological distance.
To bridge the research gaps, the current study examines whether matching the psychological distance associated with an MGC-generating device (a mobile phone or PC) with appropriate construal levels for MGC content features can enhance consumer engagement with the MGC. Specifically, we explore how MGC-generating device types (mobile phones versus PCs) and content features (social and achievement features) of MGC influence consumer engagement with the MGC on social media. We also examine these two factors' interaction effects on consumer engagement, based on CLT. We test consumer engagement with MGC empirically with data from Sina Weibo, a popular social media in China. Our data comprise MGC generated by 210 companies from 2018 to 2021, as well as consumer engagement with the MGC from Sina Weibo. Through this approach, our study enriches the literature on consumer engagement on social media by pairing MGCgenerating devices with MGC content features from the CLT perspective of psychological distance.
This paper is structured as follows. Section 2 discusses the theoretical background of this study, including MGC, the impact of content-generating devices on consumer perceptions and behaviors and the CLT. We then discuss our proposed research model and hypotheses in Section 3, before presenting the research method in Section 4. Finally, we discuss our research findings and conclude this study by identifying theoretical and practical implications, the limitations of our research and potential avenues for future research.
2. Theoretical background 2.1 Marketer-generated content MGC refers to "a firm or brand's communication created and shared through online social networks" (Meire et al., 2019, p. 25), and it is also known as firm-generated content . Marketers can interact with and promote their products or services to consumers through MGC (Hassan and Ariño, 2016). MGC can help consumers better understand a firm, its brand and its products or services (Goh et al., 2013). MGC can include various content types, such as information-focused, emotion-focused, action-inducing or commercial content (Owusu et al., 2016;Tellis et al., 2019). The core criterion for these classifications is MGC's rational appeal (for information content and transactional content) or emotional appeal (for emotional content) (Estrella-Ram on et al., 2019).

Engagement with marketergenerated content
Previous studies have found that different MGC content features can affect consumer engagement, for example, sharing, commenting and liking (Weiger et al., 2019;Yousaf et al., 2021). For example, remunerative MGC increases consumers' commenting, and informative content increases consumers' sharing of MGC (Chandrasekaran et al., 2019). Affiliative MGC drives consumer engagement through autonomous motivation, while utilitarian content drives consumer engagement through controlled motivation (Weiger et al., 2019). Some studies have examined the impacts of other MGC features on consumer engagement (McShane et al., 2021;Pezzuti et al., 2021). For instance, when marketers use more certaintyconveying words in MGC, consumers perceive their brand as more powerful and will be more likely to interact with that brand (Pezzuti et al., 2021). Including more emojis in MGC generates more likes and shares among consumers by increasing consumers' perceived playfulness (McShane et al., 2021). Table 1 presents some recent research on how MGC influences consumer engagement.
Psycholinguistics research has argued that language using more social words can convey information about a communicator's willingness to interact, as well as the quality of their interaction; meanwhile, language using more achievement-based words can provide more details about a communicator's accomplishments and initiatives (Huang et al., 2012;Stephan et al., 2010). MGC with more social or achievement words may affect consumer engagement with a brand since consumers process social and achievement-based words differently. Some natural language processing tools (such as Linguistic Inquiry and Word Count or LIWC) have been developed to calculate the proportions of social and achievement words in a text. However, prior research has seldom considered the social and achievement features when investigating the impact of the content features of MGC on consumer engagement (Packard and Berger, 2021). Therefore, an investigation of how social and achievement features of MGC influence consumer engagement is necessary from a content feature perspective.

Content-generating devices' effects on consumer perceptions and behaviors
Because of mobile technology's incredible convenience, people increasingly access websites and share information using mobile phones (Luo et al., 2021). Compared to nonmobile devices, such as PCs, mobile phones entail fewer temporal and spatial barriers for users (Ransbotham et al., 2019). People can derive more psychological comfort from touching their mobile phones and feel less temporally distant from their mobile devices than PCs Melumad and Pham, 2020;Vahedi and Saiphoo, 2018).
Social media content generated on mobile devices has been found to differ from PCgenerated content. For example, users who write reviews on mobile phones are less likely to be influenced by prior reviews in comparison with reviews generated through PCs . Moreover, the messages generated on mobile devices are much shorter (Melumad et al., 2019;Ransbotham et al., 2019), use more pictures, provide higher star ratings and require shorter time intervals than those generated through PCs (Zhu et al., 2020). Content generated on mobile phones tends to use more self-disclosure, personal language styles and private language styles than content created on PCs (Melumad and Meyer, 2020). Ransbotham et al. (2019) found that online reviews generated via mobile phones tend to include more emotional vocabulary than those via PCs.
Additionally, studies have shown that consumers harbor different perceptions of the content generated with different devices (Grewal and Stephen, 2019). For example, online reviews generated via mobile phones are perceived to have required more writing effort and have higher credibility, leading to higher purchase intentions than reviews generated through PCs (Grewal and Stephen, 2019). However, Ransbotham et al. (2019) argued that the perceived value of online reviews generated on mobile phones is lower for consumers than their corresponding perceptions of reviews produced on PCs; moreover, when consumers use INTR 32,7 nonmobile devices to read online reviews, the perceived value of reviews generated through mobile devices declines (M€ arz et al., 2017). Mobile devices' convenience reduces the perceived costs and efforts required to generate online reviews , whereas mobile devices' small screen size also increases the perceived cost of information searching for consumers (Venkatesh et al., 2003). Online reviews generated via mobile devices are more affective, more concrete and less extreme than reviews generated via PCs. Additionally, consumers value mobile reviews less than PC-generated reviews (continued ) purchasing intentions and browsing behaviorsfew studies have explored device types on consumer engagement, especially in the MGC context.

Construal level theory
CLT explains the relationship between psychological distance and an individual's thinking about an event at an abstract or concrete level (Liberman et al., 2007). CLT posits that people express information at various levels of abstraction, and psychological distance affects how people express and interpret relevant information . Psychological distance refers to a perceiver's subjective distance from a target object in his/ her psychological space (Trope and Liberman, 2003). CLT posits that, when psychological distance increases, individuals tend to use a high-level construal to represent the object; conversely, when this distance decreases, they tend to use a low-level construal (Trope and Liberman, 2003). The relationship between construal levels and psychological distance is bidirectional; when people perceive an object using a high-level construal, they also increase their psychological distance from the object, but when they use a low-level construal, this distance decreases (Darke et al., 2016;Trope and Liberman, 2010). High construal levels comprise abstracts and central features, whereas low construal levels comprise specific descriptions and detailed object features (Trope and Liberman, 2003). According to CLT, psychological distance can be determined by temporal, spatial and social distances . If an object is present in the distant future in a physically remote place, it is less related to the self and is more likely to be perceived as psychologically distant; conversely, an object in the near future and a physically close place is more related to the self and is less likely to be perceived as psychologically distant .
CLT and psychological distance are commonly used to explain consumers' cognition and behavior. For example, psychological distance has been used to explain consumers' attention to information; when a person's psychological distance from an object is far, they pay more attention to abstract and central information, but when their psychological Online reviews posted via mobile phones include fewer words but more images, as well as higher ratings and shorter time intervals than reviews via PCs Note(s): "IV" indicates independent variables and "DV" indicates dependent variables Table 2.
Engagement with marketergenerated content distance is close, they pay more attention to concrete and detailed information (Kim et al., 2008). People feel temporally and spatially closer to mobile phones than to PCs . Prior literature has stated that interactions between companies and consumers on social media, as well as companies' responses to consumers on social media, could shorten consumers' psychological distance from companies (Kim and Song, 2019;Xue et al., 2020). However, shortening psychological distance is not always beneficial. For instance, luxury brands' interactions with consumers through social media can reduce consumers' psychological distance but also reduce consumers' perceptions of a product's value and uniqueness . Additionally, prior research has used CLT to explain various consumer perceptions, preferences, information processing and behaviors by linking construal levels to psychological distance (Adler and Sarstedt, 2021;Chiang et al., 2021;McGowan et al., 2019). For instance, drawing on CLT, McGowan et al. (2019) explained how to attenuate the dissociative group effect by applying an experimental approach. Based on CLT, Chiang et al. (2021) examined how the system characteristics of interactive augmentedreality technology (e.g. navigation structures, graphical styles and information content) affect consumers' perceived ease of use, usefulness and acceptance of this technology in retail settings. Huang et al. (2021) also examined how consumers' construal levelssuch as the temporal distance or temporal orientation of promotionsmoderate the impacts of emojis' emotional intensity on their purchasing intentions in the social media advertising context. Therefore, linking construal levels to psychological distance presents a theoretical framework that explains consumers' perceptions and behaviors. Accordingly, in this study, we linked CLT with psychological distance to examine how device types (mobile phones versus PCs) in generating MGC and content features (social and achievement-based content) of MGC influence consumer engagement with MGC and how the interactions between device types and content features affect consumer engagement with MGC.
3. Hypotheses and research model 3.1 Device types and consumer engagement Mobile devices' convenience has made people rely more on them, granting them a particular psychological position. Compared to PCs, mobile phones are considered more personal. People use PCs more to work, and commonly use mobile phones to exchange messages with friends and family, watch entertaining videos or follow social media updates (Panova and Carbonell, 2018). Mobile phones' active, personal interactions psychologically comfort users and make them feel more secure than PCs (Melumad and Pham, 2020;Vahedi and Saiphoo, 2018). Mobile phones are closely connected to users (Lee et al., 2020). Therefore, mobile phones are less psychologically distant to consumers temporally, spatially and socially.
When reading MGC generated through mobile phones, consumers feel a shorter psychological distance between themselves and the MGC than they do on PCs. Research has found that such reduced psychological distance can increase consumers' trust in a brand (Brynjolfsson and Smith, 2000), their positive attitudes toward a brand (Li and Sung, 2021) and their willingness to interact with communicators (Holmqvist et al., 2015). Therefore, we assume that consumers will be encouraged to engage with MGCsuch as by liking, commenting and sharingby their reduced psychological distance to MGC generated through mobile phones. Accordingly, we hypothesize: H1. MGC generated via mobile phones leads to more consumer engagement than MGC generated via PCs.

Content features and consumer engagement
Social is defined as "relating to activities in which you meet and spend time with other people and that happen during the time when you are not working" (Cambridge University Press, 2021a). Prior research based on text analysis has shown that words with social featuressuch as hello, thanks, acceptance and friendsexpress social processes, interactions and interpersonal relationships' quality (Tausczik and Pennebaker, 2010). People have extensive, profound experiences and understandings of these social words in their daily lives (Tausczik and Pennebaker, 2010). Research has also found that, when consumers interact with social-oriented content released by marketers, they post more comments on the content online (Daugherty et al., 2008). Therefore, we assume that MGC with more social features shortens consumers' psychological distance from such content, making them more likely to interact with it, such as by liking, commenting and sharing. Accordingly, we suggest: H2. MGC with social features is positively associated with consumer engagement.
Achievement is defined as "something very good and difficult that you have succeeded in doing" (Cambridge University Press, 2021b). People can describe achievements using specific words such as winning, achieve and ambition (Tausczik and Pennebaker, 2010). Accordingly, companies have employed marketing strategies to demonstrate their brands' power and improve their reputations by disclosing achievements and outstanding performance (Mkumbuzi, 2015;Sarkar and Bhattacharjee, 2017). However, these strategies' effectiveness has been increasingly challenged since consumers can access rich information from different online channels (Budac and Baltador, 2014). Persuading consumers has become increasingly difficult in the information age (Ham, 2017). Consumers avoid content with prominent commercial features on social media (Tellis et al., 2019). Promoting a brand's achievements can be regarded as commercial advertising (Sarkar and Bhattacharjee, 2017). When MGC text includes more achievement content, consumers are more likely to perceive the MGC content as advertising, increasing their avoidance and psychological distance (Zhang et al., 2020a, b). Additionally, expressions of a company's achievements focus on publicity events, which are tedious, boring and ineffectively promote consumer interactions (Tellis et al., 2019). Therefore, we hypothesize: H3. MGC with achievement features is negatively associated with consumer engagement.

The interactive effect of content features and device types
The literature has defined information processing fluency as the degree of ease to which people process and assess information that can enhance their perceptions of and behaviors toward this information (Alter and Oppenheimer, 2008;Connors et al., 2021;Lee and Labroo, 2004). For instance, research has found that construal-based mindset congruencies can increase processing fluency and enhance readers' perceptions of messages' persuasiveness (Lee and Aaker, 2004) and their engagement with the messages (Allard and Griffin, 2017). Connors et al. (2021) also found that consumers' information processing fluency is enhanced when the psychological distance of a consumer-brand relationship is paired with an appropriate brand-information construal level, such as abstractness or concreteness. Based on the concepts of information processing fluency and the CLT, we assume that pairing an MGC-generating device's psychological distance with an appropriate construal level for that contentsuch as social features or achievement featurescan increase consumer perceptions of the content's information processing fluency, making the MGC persuasive and encouraging consumers to share, like and comment on it. Specifically, according to the CLT, the "via mobile phone" icon presented in MGC shortens the psychological distance between the MGC and consumers, causing consumers to construct Engagement with marketergenerated content the MGC at a low-level construal. Moreover, MGC with social features usually uses a low-level construal to represent specific information and content that more closely resembles daily language (Tausczik and Pennebaker, 2010). The short psychological distance to mobiledevice-generated MGC is paired with the low construal level that features the social content of MGC, potentially enhancing consumers' perceptions of the MGC's information processing fluency. The enhanced fluency makes MGC with social features more persuasive, potentially encouraging consumers to share, like and comment. Therefore, we hypothesize: H4. When MGC with more social features is generated via mobile phones, it encourages more consumer engagement.
Meanwhile, per CLT, when MGC is generated via PCs, the psychological distance between this content and consumers increases. Thus, consumers construct this type of MGC at a highlevel construal. MGC with achievement features usually emphasizes the abstract and central features of events at a high-level construal. PCs' psychological distance in generating MGC is paired with the high construal level that features achievement content in MGC, increasing consumers' perceived fluency in processing this content. The enhanced fluency also makes MGC with achievement features more persuasive, potentially encouraging consumers to share, like and comment. Therefore, we hypothesize: H5. When MGC with more achievement features is generated via PCs, it encourages more consumer engagement.

Research model
Drawing on the CLT and psychological distance, as well as the prior literature, we established a research model to investigate how device types in generating MGC and the content features of MGC influence consumer engagement with MGC. MGC's social and achievement features represent how frequently social words and achievement-based words occur in MGC text, and the devices used to generate MGC on social media include mobile phones and PCs. We assume that device types and the social and achievement features affect consumer engagement and device types moderate the impacts of the content features (social features and achievement features) of MGC on consumer engagement. Figure 1 depicts the research model in this study.

Method
We empirically tested our research model using the MGC data posted on Sina Weibo (weibo. com) by 210 companies. Notably, Sina Weibo, dubbed the Twitter of China, is a popular social media platform, with 523 million monthly active users . It is one of the

Variables
Words are the basic unit of text content, and specific words' frequency in content can reflect that content's features (Pezzuti et al., 2021). Following prior research, we used the Chinese dictionary of the LIWC software to encode and calculate the proportion of social and achievement-based words in our collected MGC to measure the social and achievement features of each MGC (Pezzuti et al., 2021). LIWC uses natural language processing to classify various categories of words in text content and calculate word frequencies (Tausczik and Pennebaker, 2010). This software has been widely used to assess social media's content features (Grewal and Stephen, 2019;Pezzuti et al., 2021). LIWC contains a total of 80 dictionaries that define and list words such as personal pronouns, auxiliary verbs, affective words, social words and achievement-based words (Huang et al., 2012;Packard and Berger, 2021). For instance, the social dictionary contains 587 Chinese words that describe social processes, social interactions and interpersonal relationship quality in text content (e.g. hello, dating, thanks, family, friends, acceptance and greeting). Meanwhile, the achievement dictionary contains 352 Chinese words that describe success and the process of pursuing success (e.g. leader, ambition, winning, achieve, skillful, success, achievement and expert) (Huang et al., 2012;Packard and Berger, 2021). These specific words' frequency in MGC can reflect what content generators wish to express, constituting MGC's content features. In our final data set, 86.0% (n 5 108,491) of MGC records contained at least one word representing social features, and 47.8% (n 5 60,320) contained at least one word representing achievement features. And 25,681 MGC records had been generated via mobile phones, whereas 100,444 via PCs. We set up a dummy variable to indicate the devices used to generate MGC. Mobile phones were coded as 1, and PCs were coded as -1. Following Pezzuti et al. (2021), we assessed consumer engagement using the total number of likes, comments and shares for each MGC. Additionally, we included some control variables that have been found to affect consumers' information processing, including word counts of each MGC message, the inclusion of any pictures, the inclusion of any videos, the frequency of affective words and the frequency of personal pronouns (Labrecque et al., 2020;Lee et al., 2020;Ransbotham et al., 2019;Vries et al., 2012). Our model's construct definitions are presented in Table 3.

Data analysis
We first evaluated the statistical distribution of the data set. The number for consumer engagement (the total number of likes, comments and shares) for each MGC was count data Therefore, negative binomial regression was employed in the data analysis since it is suitable for count data that exhibit over-dispersion (Zeileis et al., 2008). The formula for our data analysis is presented below.

Results
Our results of negative binomial regression analysis reveal that our model's likelihood ratio test is significant (χ 2 5 4536.3; p < 0.001), indicating that negative binomial regression is suitable for this study (Zeileis et al., 2008). We estimated a series of regressions to test our hypotheses (see Table 4). For each model, we checked each variable's variance inflation factor (VIF) value. The greatest VIF value in the models is 1.57, below the vigilance threshold of 5.0 (O'Brien, 2007), indicating that multicollinearity is not a critical issue in this study. First, we tested the impacts of the independent variables on consumer engagement (see model 1). The test results show that device types significantly affect consumer engagement (χ 2 5 2161.8; β 5 0.48; p < 0.001). Compared to PC-generated MGC, mobile-phone-generated MGC receives more consumer engagement, confirming H1.
Models 2 and 4 tested how content features (social and achievement features) of MGC influence consumer engagement with MGC. The results show that MGC's social features have a significant positive impact on consumer engagement (χ 2 5 84.29; β 5 0.07; p < 0.001) and that MGC's achievement features have a significant negative impact on consumer engagement (χ 2 5 202.17; β 5 À0.08; p < 0.001), while the impact of device types on consumer engagement is significant (β 5 0.48 and p < 0.001 for Model 2; β 5 0.48 and p < 0.001 for Model 4). Therefore, H2 and H3 are supported.
We then tested the interaction effect of device types and content features (social and achievement features) on consumer engagement (see models 3 and 5). Model 3 includes the interaction between device types and social features, based on model 2. The test results show that the interaction between device types and social features has a significant positive impact on consumer engagement (χ 2 5 107.53; β 5 0.08; p < 0.001), demonstrating that MGC with more social features generated via mobile phones can encourage more consumer engagement than corresponding content generated via PCs, confirming H4. Model 5 includes the interaction between device types and achievement features, based on model 4. The test results show that the interaction between device types and achievement features has a significant negative impact on consumer engagement (χ 2 5 À82.62; β 5 À0.08; p < 0.001). Therefore, MGC with more achievement features generated via PCs can increase consumer engagement more than corresponding content generated via mobile phones, confirming H5.
Finally, we tested the main impacts of device types, social features, achievement features and their interaction on consumer engagement based on models 6 and 7. Model 6 includes the control variables and all independent variables. The results show that the three independent variables' main effects on consumer engagement are significant (χ 2 5 2387.61; p < 0.001). MGC generated via mobile phones receives more consumer engagement than MGC generated via PCs (β 5 0.47; p < 0.001). MGC's social features have a significant positive impact on consumer engagement (β 5 0.06; p < 0.001), and achievement features exert a significant negative impact on consumer engagement (β 5 À0.04; p < 0.001), verifying hypotheses H1-H3. Model 7 includes the interaction of device types and social features, as well as the interaction of device types and achievement features, based on model 6. The results confirm the significant interaction effects of device types and content features on consumer engagement (χ 2 5 76.30; p < 0.001). The interaction of device types and social features has a significant positive effect on consumer engagement (β 5 0.08; p < 0.001). Therefore, MGC with more social features generated via mobile phones can generate more consumer engagement than corresponding content generated via PCs. The interaction of device types and achievement features has a significant negative effect on consumer engagement (β 5 À0.08; p < 0.001); therefore, MGC with more achievement features generated via PCs can

Discussion
This study investigates how MGC-generating devices and MGC content features influence consumer engagement based on panel data comprising MGC records and consumer engagement activities. We found that device types significantly influence consumer engagement with MGC. Specifically, MGC generated via mobile phones leads to more consumer engagement than MGC generated via PCs. Prior literature has indicated that mobile phones are temporally, spatially, and socially closer to consumers than PCs in terms of psychological distance . Therefore, MGC generated via mobile phones reduces the psychological distance between the MGC and consumers, making the MGC to be more persuasive, which will encourage more consumer engagement than MGC generated via PCs. This finding echoes Grewal and Stephen's (2019) study, which found that mobile-phonegenerated UGC on social media attracts more consumer engagement than corresponding PCgenerated UGC, though the current study has focused on how device types affect consumer engagement with MGC on social media instead of UGC. Our findings emphasize that device types play an essential role in triggering consumer engagement with MGC on social media. The current study also found that MGC's social features positively affect consumer engagement, whereas its achievement features negatively affect consumer engagement. Prior literature has argued that content with social features makes people feel more lifelike. Thus, the social features of MGC are close to consumers' daily lives (Tausczik and Pennebaker, 2010), which can shorten the psychological distance between MGC and consumers. The short psychological distance between MGC and consumers triggers consumers' positive perceptions of the MGC, such as credibility and persuasiveness of the MGC, encouraging consumer engagement through likes, shares and comments. On the other hand, consumers perceive MGC promoting achievements as advertising-oriented (Sarkar and Bhattacharjee, 2017), increasing the psychological distance between MGC and consumers. When consumers perceive achievement-based MGC as promotion content, aiming to persuade them to trust a brand or purchase products and services, they are less likely to engage with the MGC by sharing, commenting or liking this content as consumers normally avoid their interaction with the commercial-advertising MGC. Therefore, consumers do not share, comment on or like such MGC. In other words, consumers engage less with this type of MGC.
Moreover, we found significant interaction effects between MGC content features and device types on consumer engagement. Specifically, MGC with more social features generated via mobile phones leads to more consumer engagement than PC-generated MGC, and MGC with more achievement features generated via PCs leads to more consumer engagement than mobile-phone-generated MGC. These findings can be explained by the congruency effect, in which the psychological distance of MGC-generating devices is paired with MGC content features' construal levels. As prior literature has indicated, mobile phones are psychologically closer to consumers than PCs . Thus, an icon signifying that MGC was generated via a mobile phone shortens the psychological distance between the MGC and consumers, causing consumers to construct this content at a low-level construal. Meanwhile, when MGC is generated via PCs, the psychological distance between this content and consumers increases. Thus, consumers construct this content at a high-level construal . As we discussed in the previous paragraph, MGC with more social features can also shorten the psychological distance between the MGC and consumers, and this content is constructed at a low-level construal, while MGC with more achievementbased features is constructed at a high-level construal. The pairing of MGC's social features with mobile phones and the pairing of MGC's achievement features with PCs increase consumers' MGC-processing fluency, satisfying their construal-level and content preferences and encouraging consumer engagement. Connors et al. (2021) found a similar congruency effect from the construal levels of consumer-brand relationships and appropriate construal levels for brand marketing information on improving consumers' brand evaluations and spending. The current research has demonstrated that appropriately pairing the construal levels of MGC content features and MGC-generating devices can enhance consumer engagement through the congruency effect. These findings also help explain conflicting findings on how mobile devices influence consumer attitudes and behaviors vis-a-vis online reviews (e.g. Ransbotham et al., 2019;Tseng and Wei, 2020;Zhu et al., 2020).

Theoretical implications
This study offers several theoretical contributions to the literature. First, this study contributes to the research on consumer engagement in social media by proposing a congruence perspective in explaining the interaction effects of device types and MGC content features on consumer engagement based on the CLT of psychological distance. Our findings on the interaction effects of device types and MGC content features establish boundary conditions for content marketing's efficacy in consumer engagement across both PC-based and mobile channels. While previous studies have concentrated on the direct effect of device types or content features on consumer responses (Grewal and Stephen, 2019;Pezzuti et al., 2021), the current study has examined the interaction effect of MGC content features and device types on consumer engagement, providing a deeper understanding of how to combine content strategies and technological strategies in order to enhance consumer engagement with MGC by pairing the construal levels of content-generating devices and content features of MGC.
Second, the current work enriches the MGC literature by verifying how the device types used in generating MGC influence consumer engagement with MGC from the CLT perspective of psychological distance. Prior research has focused on UGC when investigating how device types used in generating UGC influence consumer engagement. The current study is, to our knowledge, the first empirical research to investigate the effects of device types on consumer engagement in the MGC context, which extends the understanding of the role of device types on consumer engagement from the UGC literature to the MGC context. This study also provides evidence that the CLT perspective of psychological distance can explain MGC-generating devices' role in triggering consumer engagement behavior toward MGC.
Third, this research contributes to the MGC literature by investigating the impact of MGC content features on consumer engagement. The positive impact of MGC's social features on consumer engagement and the corresponding negative impact of MGC's achievement features indicate that different MGC content features can determine consumers' psychological distance from MGC, potentially leading to different consumer responses to MGC. This work has answered recent calls for more research examining MGC content features and their influence on consumer behavior (Pezzuti et al., 2021).

Practical implications
Our findings can be translated into practical guidelines to help companies make informed decisions regarding their MGC strategies in social media marketing. First, our findings show that MGC generated via mobile phones generates more consumer engagement than MGC generated by PCs. Since most social media platforms currently label MGC's generating device type, marketers should consider increasing consumer engagement by generating MGC via Engagement with marketergenerated content mobile devices. The data used in this study also show that mobile devices seem underutilized in MGC, generating approximately 20% of MGC applied in this study. This finding suggests that companies should increase their use of mobile devices to generate MGC. Second, our study shows that the social features of MGC can trigger consumer engagement, but achievement features can reduce consumer engagement. These findings indicate that companies should consider using social features more in their MGC text content in their social media marketing to increase consumer engagement with MGC.
Finally, the findings on the interaction effects between MGC's content features (social and achievement features) and MGC-generating devices offer some practical guidelines for companies on how to combine MGC-generating device types and MGC's content features to enhance consumer engagement with MGC. Specifically, MGC text including more social features should be generated via mobile devices, potentially leading to more consumer engagement. Moreover, MGC containing more achievement features should be generated via PCs, potentially enhancing consumer engagement. Although MGC with more achievement features can reduce consumer engagement due to its increased psychological distance, posting the MGC with more achievement features via PCs will enhance consumer engagement due to the congruency of the construal levels of psychological distance.

Limitations and future research avenues
This study faces several limitations that future research can resolve. First, previous studies have shown that information affects consumers' responses across various social media platforms differently (Pezzuti et al., 2021). In this study, we focus only on one popular social media platform in China (Sina Weibo), which might limit our findings' generalization to other social media platforms. Therefore, future research could replicate this study across different social media platforms. Second, our research examines only how social and achievementbased content features of MGC and device types in generating MGC affect consumer engagement with MGC. Future research could explore how other MGC content features and device types used in generating MGC influence consumer engagement, as well as their interaction effects. Additionally, future studies could extend the current research to other consumer responses, such as brand attitudes, brand preferences and consumer purchasing intentions. Finally, our study used an established dictionary that equally weighted all words. Future research could consider more granular data analysis approaches to identify the most effective social and achievement-related words in MGC, such as text mining and machine learning.