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The conclusions of studies on the factors correlated with the perceived usefulness of online reviews are inconsistent due to differences in research perspectives, research objects, research methods and data types. This study conducted a meta-analysis to verify a proposed model of perceived usefulness to obtain general conclusions.

A meta-analysis was conducted to study the factors correlated with the perceived usefulness of online reviews based on 51 studies.

The results indicate that, with the exception of negative reviews, the order of relevance for the perceived usefulness of online reviews is as follows: the trust tendency of review readers, review replies, review depth, review pictures, reviewer trustworthiness, positive reviews, reviewer expertise, review time and reviewer information disclosure. Perceived usefulness was significantly positively correlated with purchase intention. Review time, positive reviews and negative reviews were also more significantly correlated with perceived usefulness for search products than for experiential products. Review depth, reviewer trustworthiness, reviewer expertise and purchase intention had greater positive correlations with perceived usefulness for experiential products than for search products.

This study proposes an extended information adoption model based on argument quality and source credibility. The model includes personal factors such as the trust tendency of review readers, constructs a theoretical model of the factors correlated with the perceived usefulness of online reviews and considers the moderating effects of product type.

This study aims to assess the relative importance of the argument strength, argument sidedness, writing quality, number of arguments, rated review usefulness, summary review rating and number of reviews in determining the perceived usefulness and credibility of an online review. Additionally, the authors use insights from the elaboration likelihood model (ELM) to explore the effect of consumers' product category involvement on the cues' relative importance.

A conjoint analysis (N = 287) is used to study the relative importance of the seven previously mentioned attributes. A balanced orthogonal design generated eight cards that correspond to individual reviews. Respondents scored all eight cards in a random order for perceived usefulness and credibility.

Overall, argument strength is the most important cue, while summary review rating and the number of reviews are the least important for perceived review usefulness and credibility. The number of arguments is more important for people who are more highly involved with the product, while writing quality and rated review usefulness are relatively more important for the low-involvement group.

This study provides a comprehensive test of how consumers perceive online reviews, as it the first to the authors’ knowledge to simultaneously investigate a large set of cues using conjoint analysis. This method allows for the implicit valuation (utility) of the individual cues, revealing the cues' relative importance, in a setting that comes close to a real-life context. Besides, insights of the ELM are used to understand how the relative importance of cues differs depending on the level of review readers' product category involvement.

The study aims to explore the effects of photograph quality on visual appeal, perceived usefulness and viewers' travel intentions from rational and irrational perspectives while simultaneously providing some references for the management and marketing of tourism destinations.

The study comprises four experiments combined with structural equation modeling to explore the influence mechanism of photograph quality on travel intentions.

(1) Higher-quality photographs offer greater visual appeal and perceived usefulness to viewers, and these relationships are moderated by the photograph source. Specifically, high-quality photographs generated by other tourists have more visual appeal and perceived usefulness to viewers. However, there are no significant differences in the impact of low-quality photographs generated by other tourists and destination marketing organizations (DMOs) on visual appeal and perceived usefulness. (2) Visual appeal and perceived usefulness significantly affect viewers' travel intentions, and visual appeal positively affects perceived usefulness. (3) Travel experience positively moderates the effects of visual appeal and perceived usefulness on viewers' travel intentions.

The study explores the effects of the visual appeal (irrational factor) and perceived usefulness (rational factor) associated with photograph quality on viewers' travel intentions. Photograph source and travel experiences have moderating effects on this influence mechanism.

As technology has increasingly disrupted traditional commerce, there is a need for inclusive growth to ensure that no group – particularly the underprivileged – is left behind. Against this backdrop, this paper aims to shed light on mobile commerce (m-commerce) adoption among street vendors. This study conducts an experiment to investigate the contribution of online reviews and relevant factors in enhancing the perceived usefulness and adoption of m-commerce.

This study used a 2 (perceived ease of use: high vs low) × 2 (trust in service provider: high vs low) × 2 (online review: positive vs negative) between-subjects design, resulting in eight experimental groups. The level of the online review was manipulated, and the degrees of perceived ease of use and trust were measured.

Perceived usefulness depends on online reviews when users perceive incongruent information (e.g. high ease of use but low trust); that is, users who saw positive reviews more strongly perceived the usefulness of m-commerce. On the contrary, perceived usefulness does not vary based on online reviews if users perceive congruent information (e.g. high ease of use and high trust).

This research advances the knowledge of m-commerce adoption by exploring the interaction of perceived ease of use, trust and online reviews, a combination that has not been addressed in previous empirical studies.

This study aims to investigate the promoting effects of the quantity and quality of online review user-generated photos (UGPs) on perceived review usefulness. The research further tests the hindering effect of human facial presence in review photos on review usefulness.

Based on review samples of restaurants in a tourist destination Las Vegas, this study used an integrated method combining a machine learning algorithm and econometric modeling.

Results indicate that the number of UGPs depicting a restaurant’s food, drink, menu and physical environment has positive impacts on perceived review usefulness. The quality of online review UGPs can also enhance perceived review usefulness, whereas facial presence in these UGPs hinders perceived review usefulness.

Findings suggest that practitioners can implement certain tactics to potentially improve consumers’ willingness to share more UGPs and UGPs with higher quality. Review websites could develop image-processing algorithms for identifying and presenting UGPs containing core attributes in prominent positions on the site.

To the best of the authors’ knowledge, this study is the first to present a comprehensive analytical framework investigating the enhancing or hindering roles of review photo quantity, photo quality and facial presence in online review UGPs on review usefulness. Using the heuristic-systematic model as a theoretical foundation, this study verifies the additivity effect and attenuation effect of UGPs’ visual elements on judgements of online review usefulness. Furthermore, it extends scalable image data analysis by adopting a deep transfer learning algorithm in hospitality and tourism.

This paper aims to investigate the impact of perceived usefulness of online reviews and crowd cues on restaurant selection. In addition, the authors also examine the moderating role of perceived crowding and gender in this process.

The proposed hypotheses were tested with survey data (N = 200) collected from customers visiting full-service restaurants in Malaysia. The data were analyzed using SEM through Smart PLS.

The findings supported that the perceived usefulness of online reviews and perceived crowding have a positive effect on a consumer's purchase intentions, i.e. their decision of restaurant selection. Besides, a higher level of perceived crowding strengthens the relationship between the perceived usefulness of online reviews and their purchase intentions. This finding delineates that consumers prefer to dine in a crowded place with useful online reviews in an unfamiliar place. Finally, the results show that the effect of the usefulness of online reviews on purchase intentions does not vary with respect to gender (no significant contingent effect). However, the effect of perceived crowding varies with respect to gender – male customers have higher intentions to join crowded restaurants as compared to females.

Limitation of this study is its cross-sectional research design; data were collected in a single time frame. Longitudinal research design can be used to get in-depth knowledge of this phenomenon. Secondly, a non-probability sampling technique was used in this study, future research can used probability sampling technique to enhance generalizability of the study. Moreover, this study focused on the human crowding aspect, future studies can cover both aspects of crowding (human crowding and spatial crowding) in retailing or other service sectors (Blut and Iyer, 2020).

This study has multiple practical implications.

This study extends the current research on usefulness of online reviews and perceived crowding by investigating its direct and conditional effects. Specifically, the authors contribute in extant research by explaining its differential effects for male and female customers, when they select which restaurants to dine.

The purpose of this paper is to investigate the relationships between five characteristics of social shoppers’ online reviews (the number of all reviews made by a reviewer, the number of friends of a reviewer, the review score, the number of review words, and images/photos) and the usefulness, funniness, and coolness to viewers for the restaurant businesses and the health and wellness businesses.

A sample of 1,114 online reviews of social shoppers was collected from Yelp.com. A zero-inflated Poisson regression was used due to a high number of zero votes in the dependent variables for usefulness, funniness, and coolness. The regression identified the review characteristics that are strongly associated with the number of usefulness, funniness, and coolness votes made by viewers.

The analysis shows that for the health and wellness businesses, all three dependent variables (usefulness, funniness, and coolness) have the number of reviews, the number of friends, and the number of words as significant independent variables. The results indicate that a reviewer who has more friends and is more experienced in giving reviews is likely to be more influential in generating a perceived value of the online review. The analysis also shows that all three dependent variables of the restaurant businesses have the number of words as a significant independent variable. It is found that there is a negative relationship between the review score and the usefulness votes for both restaurant businesses and health and wellness businesses. The effect of the review score on the coolness votes was not consistent.

This study is the first research attempt in understanding social shoppers’ online reviews and their usefulness, funniness, and coolness to viewers, and therefore makes significant contributions to research and practice. The comparison was made between restaurant businesses and health and wellness businesses. The result indicates that for the health and wellness businesses, managers need to pay attention to social shoppers with a high number of friends and high number of words in a review. It is also noted that it is necessary to analyze review characteristics separately for each business type. However, as is typical in many empirical studies, this study is not without limitations. While the author limited the analysis of social shoppers’ online reviews to the five characteristics, additional variables may influence the number of votes, too. This study is limited to social shoppers’ reviews and the findings may not be generalized to regular customers’ online reviews. Future research should also examine whether similar results can be obtained at other review sites such as TripAdvisor and Zagat.

Despite the potential significance of social shoppers’ online reviews, the critical mass of empirical studies still lacks in this area. For a more comprehensive interpretation of review characteristics, this study develops hypotheses based on the literature review on electronic word of mouth and source credibility models and investigates the effect of the five review characteristics on the viewers’ perceived usefulness, funniness, and coolness. Unlike previous studies focused on a single business type, this study compares the results obtained for restaurant businesses and health and wellness businesses and demonstrates that viewers in each business type respond differently to social shoppers’ online reviews.

Young consumers are increasing using electronic word-of-mouth (eWOM) in travel social networking sites to make purchase decisions. This paper aims to test the extended Information Adoption Model (IAM) that places perceived usefulness and information adoption as consequences of argument quality, source credibility, information quantity and emotive word comprehension, and as an antecedent of purchase intentions.

Data are collected through survey questionnaire from 405 hotel young customers in Malaysia, who had experienced travel social networking sites. The hypothesized relationships were analysed using structural equation modelling.

The results show that argument quality, source credibility, information quantity and emotive word comprehension have positive effect on the perceived usefulness of eWOM. Perceived usefulness has positive influence on the information adoption of eWOM, which in turn predicts the young consumers’ purchase intentions.

The present study strengthens and advances the existing literature on tourism, social media and marketing by offering an extension to the IAM. The proposed extended model of IAM is verified and applied effectively in the context of eWOM for travel social networking sites.

Practitioners and marketers of travel social networking sites can improve the usability and effectiveness of eWOM to attract more young consumers.

The study contributes to the extension of IAM by adding information quantity and emotive word comprehension. This research validated the significant roles of eWOM argument quality and source credibility in predicting the information usefulness of eWOM.

Electronic commerce (e-commerce) is growing rapidly and the e-retailers are finding it pertinent to enhance customers’ online shopping experiences and engage them with e-commerce portals. Against this backdrop, the purpose of this study is to develop a conceptual model of customer engagement, where credibility and usefulness of online reviews are found to trigger the adoption of reviews and customer trust that augments customer engagement.

A survey method design has been used to capture responses from 219 young customers (university students) of a reputed university in India. The hypothesized relationships have been examined through multiple regression analysis.

The findings of this study corroborate that the credibility and information usefulness of online reviews induce the adoption of reviews and propensity to trust e-commerce websites. The propensity to trust the reviews has been found to lead the adoption of reviews. The adoption of reviews is found to have a significant impact on the customer’ engagement with these portals.

The present study contributes to the theories of online marketing in the space of e-shopping, online reviews, customer trust, customer engagement and online shopping behavior. Further, this study provides a framework for managers to engage customers by triggering customers’ online trust through the facilitation of credible and useful reviews.

The study aims at understanding the role of different attributes associated with the online reviews’ credibility and information usefulness in driving customer engagement with specific focus on online shopping through the utility of online devices. The study is one of the pioneering empirical studies that explore the role of online reviews in driving customer engagement.

Recent figures show that users are discontinuing their usage of TripAdvisor, the leading user-generated content (UGC) platform in the tourism sector. Hence, it is relevant to study the factors that influence travelers’ continued use of TripAdvisor.

The authors have integrated constructs from the technology acceptance model, information systems (IS) continuance model and electronic word of mouth literature. They used PLS-SEM (smartPLS V.3.2.8) to test the hypotheses using data from 297 users of TripAdvisor recruited through Prolific.

Findings reveal that perceived ease of use, online consumer review (OCR) credibility and OCR usefulness have a positive impact on customer satisfaction, which ultimately leads to continuance intention of UGC platforms. Customer satisfaction mediates the effect of the independent variables on continuance intention.

Managers of UGC platforms (i.e. TripAdvisor) can benefit from the findings of this study. Specifically, they should improve the ease of use of their platforms by facilitating travelers’ information searches. Moreover, they should use signals to make credible and helpful content stand out from the crowd of reviews.

This is the first study that adopts the IS continuance model in the travel and tourism literature to research the factors influencing consumers’ continued use of travel-based UGC platforms. Moreover, the authors have extended this model by including new constructs that are particularly relevant to UGC platforms, such as performance heuristics and OCR credibility.