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The purpose of this paper is to provide a comprehensive review on electronic word-of-mouth (eWOM) credibility. Further, the authors propose a comprehensive and integrated model on eWOM credibility.

The authors conducted a systematic review of the extant literature on marketing, sociology and psychology to identify the factors that affect eWOM credibility. Further, the authors developed themes and identified factors which lead to eWOM credibility.

Four factors were identified, i.e. content, communicator, context and consumer, which affect eWOM credibility. Several variables associated with these four factors were identified, which result in eWOM credibility. Further, the authors developed 22 propositions to explain the causal relationship between these variables and eWOM credibility.

The conceptual model needs empirical validation across various eWOM platforms, i.e. social networking websites, e-commerce websites, etc.

Managers and e-commerce vendors can use these inputs to develop specific design elements and assessment tools which can help consumers to identify credible eWOM messages. Credible eWOM messages, in turn, will increase the “trust” and “loyalty” of the customers on e-commerce vendors.

This paper provides a conclusive takeaway of eWOM credibility literature by integrating multiple perspectives and arguments from the extant literature. This study also presents an integrated model, which provides a theoretical framework for researchers to further examine the interaction effect of various variables, which results in eWOM credibility.

The peer review history for this article is available at: https://publons.com/publon/10.1108/OIR-06-2020-0263

With the ever-expanding online shopping, electronic word-of-mouth (eWOM) has become a significant factor affecting the consumer decision-making behaviour. This is specially the case when considering Generation Y (Millennials), who are old enough to be independent buyers and young to be almost immersed in online living. This article aims to assess the impact of eWOM on purchase intention by developing a conceptual model of hypotheses encompassing a multitude of factors that may be associated with this relationship.

The researcher investigates what factors impact eWOM credibility and make the consumer may adopt it when making a purchase. To examine our research model, a quantitative approach is employed for this purpose using a sample through online survey from Thailand – where there is a large number portion Generation Y consumer base.

It was found that source style as a visual attribute information is the most significant factor that may impact eWOM credibility in addition to source credibility, argument quality and source homophily, respectively.

From a practical point of view, it helps firms to understand what needs to be taken into consideration when building their marketing strategy.

This is believed to add significant insights into the eWOM literature by identifying its route of impact toward the purchase intention on Generation Y.

This study aims at building a framework for the electronic word-of-mouth (eWOM) response under the social media environment. The elaboration likelihood model was adopted to explain how message source credibility and message appeal jointly influence the eWOM response process, while source credibility provides a central route and message appeal plays a peripheral route for information processing.

This study used a scenario design to test the decision behavior in the Facebook environment through message content manipulation. A convenience sampling method was adopted in this study. We collected 203 valid questionnaires and tested this research model with LISREL 8.8. This study used a two-stage structural equation modeling data analysis method with LISREL 8.8, by which the measurement model was assessed through confirmatory factor analysis for the reliability and validity of the research model, and the causal relationship among factors was assessed through exploratory factor analysis .

The results showed that 53% variance of eWOM responses could be explained by message source credibility and emotional message appeal from the elaboration likelihood model perspective. Message source credibility plays a central role in the social media environment. The model was further tested with a demographic profile analysis for both gender and age. It is found that a female user is influenced by both source credibility and emotional appeal, but a male user is only influenced by message source credibility. The mature age group is more responsive to eWOM messages.

The sample might not represent all social networking sites (SNS) users. The participants represent a small segment of the Facebook population around the globe. Secondly, this research design could be improved by using more recreational messages to test the effects of message appeal and message source credibility. Thirdly, the mobile phone is a type of physical product rather than an experiential product. Future studies could try to identify the same eWOM determinants with different SNS functions, for example, the inbox message function. Similarly, Facebook users are allowed to use both text and pictures to disseminate promotional messages.

This study provides an insight for SNS administrators regarding the determinants of driving more customer responses toward a message. Message source credibility and message appeal are identified as the antecedents for eWOM responses in SNS. Companies could make use of this finding to improve their marketing communication strategy in SNS. The finding can inform administrators of the importance of focusing on both customers’ psychological state and message attributes during the dissemination of promotional messages to improve the efficiency of the promotional effort. Companies aimed at receiving different types of eWOM responses in SNS may need to consider other factors for creating their promotional messages.

Previous studies have mainly identified factors influencing eWOM responses from the people-centered variables such as personal traits and social relationships. This study proposes that the eWOM response is a dual information processing process that can be explained by the ELM. When a user processes information in SNS, he follows both the central route and the peripheral route (i.e. source credibility and message appeal) which can influence the eWOM response. It is the first time that the source credibility is investigated as the central route in ELM model.

The purpose of this paper is to explore the model of enhancing the electronic word-of-mouth (eWOM) effects through the virtual community by discussing the relationship among sense of virtual community, social influence and eWOM effects.

This research adopted structural equation modeling to test the proposed model, and the structural model showed a good fit. This research sample consisted of 492 members who have used Facebook for at least half-a-year.

The results indicated that sense of virtual community had effects on normative influence, informative influence, and perceived eWOM review credibility. Both social influence and perceived eWOM review credibility had effects on eWOM review adoption. Social influence in virtual community partially mediated the relationship between virtual community members’ sense of virtual community and perceived eWOM review credibility. Virtual community members’ perceived eWOM review credibility partially mediated the relationship between normative/informative influence and eWOM review adoption.

This study discussed conclusions and managerial implications of the findings.

This research filled a void that most of the previous studies in this area focussed on a single social interaction perspective. The authors argued that community studies should incorporate and distinguish SOVC and social influence factors.

Based on message source theory, the purpose of this paper is to use positive electronic word‐of‐mouth (eWOM) settings to examine the influence of message source credibility on brand attitude (brand trust, brand affection, and purchase intention). The current study also uses the elaboration likelihood model to examine the moderating effect of product involvement on the relationships between message appeals (rational vs emotional) and brand attitude, as well as between message source credibility and brand attitude.

Data were collected via internet questionnaires. Based on the internet investigation and pretest, this study chose the stimuli for research products, virtual brands, eWOM, and message source credibility. Via a 2 (notebooks vs shampoo) *2 (appeal: rational vs emotional) experimental design, 211 effective samples were collected to verify the hypotheses of this study.

The results, for both notebooks and shampoo, are: the positive eWOM message with higher message source credibility indicates a better brand attitude than the eWOM message with lower message source credibility, and this effect is not moderated by the degree of product involvement, indicating its robustness. Second, with a high degree of product involvement, the rational appeal indicates a better brand attitude than the emotional appeal; no significant difference is found when product involvement drops to a low level.

Previous research investigating the moderating effect of involvement on the effects of message‐appeal types and the message source credibility of eWOM is rare. The main contribution of this study is to fill this gap.

The purpose of this paper is to examine what influence travelers’ adoption of online reviews, and whether the online reviews will influence their travel planning decisions.

Data were collected from 193 respondents from eWOM websites and analyzed using structural equation modeling.

The results revealed that eWOM has a significant influence on travel decisions. Furthermore, travelers were willing to adopt information from eWOM and this information was useful in their travel planning and decisions. Gender and time spent on online reviews were found to affect travel planning and decisions. Travelers also found that the reviews and issues raised in eWOM had credibility and were of good quality.

The study was not able to incorporate all factors which may be relevant to this study and so further theoretical development may be necessary to develop the conceptual model. The sample size, while adequate, can be expanded further.

Operators and administrators of eWOM can use these findings to develop more user-friendly interfaces so that more positive reviews and sales can be generated.

The results showed that travelers who adopt the information in eWOM will, in turn, use eWOM in their travel planning. This confirms the importance of eWOM and travelers in general will translate their pre-travel decisions into actual travel planning.

This research extended existing eWOM and information system adoption studies and focused on the travel planning context. This research validated the significant roles of eWOM argument quality and credibility in predicting the information usefulness of eWOM.

The nature of digital media channels are important factors in explaining consumers’ behavior over the Web, and specifically on social network sites (SNS). The purpose of this paper is to propose a conceptual framework explaining consumer engagement with electronic word of mouth (eWOM) communication via SNS, based on key attributes of this media channel.

Based on the expectancy value theory (EVT), a conceptual framework is proposed to model the effect of eWOM channel attributes on eWOM engagement process. Consumer eWOM engagement is conceptualized as a second-order construct. A structural equation modeling procedure was employed to empirically test the model using data collected from two social media communication channels.

First, results suggest that engagement with eWOM can be conceptualized as a second-order construct based on user tendency to receive or share eWOM with other network members. Second, the path analysis model supports the employment of EVT and shows that two key attributes of eWOM channels, social capital and credibility, significantly affect consumer attitude toward eWOM via SNS. Attitude toward eWOM, in turn, affects eWOM engagement. Third, SNS channel type moderates the effect on attitude.

Marketing communication practitioners should note that the strength of social ties plays a key role in spreading eWOM on SNS effectively. This insight should be employed a part of social media marketing strategy.

This is first research that models the effect of social media attributes on eWOM engagement and demonstrates the moderating role of channel type. The model is highly valuable in light of the importance of the concept of engagement in internet research.

This study aims to investigate the relationships between electronic word of mouth (eWOM) source credibility, perceived risk and information usefulness and how they influence tourists’ destination visit intention and online review involvement.

Data for this quantitative study were collected via an online survey from 460 participants and analyzed using a partial least squares analysis.

All four dimensions of eWOM source credibility reduce travelers’ perceived risk associated with destination visits, among which homophily has the greatest influence. Lower levels of perceived risk are associated with higher perceived information usefulness, thus boosting tourists’ eWOM involvement and intention to visit a destination.

Results offer practical implications for how the tourism industry can exploit eWOM as an information source that consumers frequently consult. The results are also valuable for Destination Marketing Organizations, allowing them to determine what type of information promotes positive tourist attitudes and behaviors toward destinations.

To the best of the authors’ knowledge, this study is one of the first studies to examine the interaction between eWOM credibility, perceived risk and information usefulness and their effect on consumer behaviors in the tourism context.

eWOM 来源可信度对目的地访问意愿和在线参与的影响：以中国游客为例

本研究调查了 eWOM 来源可信度、感知风险和信息有用性之间的关系, 以及它们如何影响游客的目的地访问意图和在线评论参与度。

这项定量研究的数据是通过对 460 名参与者的在线调查收集的, 并使用偏最小二乘法分析。

eWOM 来源可信度的所有四个维度都降低了旅行者与目的地访问相关的感知风险, 其中同质性影响最大。较低的感知风险水平与较高的感知信息有用性相关, 从而提高游客的 eWOM 参与度和访问目的地的意愿。

本研究结果为旅游业如何利用 eWOM 作为消费者经常咨询的信息源提供了实际意义。结果对 DMO 也很有价值, 使他们能够确定哪些类型的信息可以促进游客对目的地的积极态度和行为。

本论文是首批研究 eWOM 可信度、感知风险和信息有用性之间的相互作用及其对旅游背景下消费者行为的影响的研究之一。

Electronic word of mouth (eWOM) is a considerably influential factor for consumers to search for product information. Nowadays, consumers can easily post visual information (e.g. pictures or videos) to convey product information and consumption‐related experiences. Yet, prior eWOM studies focused primarily on the verbal information of eWOM. Few studies have paid sufficient attention to the effects of visual information in eWOM communication. The purpose of this paper, therefore, is to employ blogs to investigate the effects of visual information on consumers' perception of eWOM message quality, credibility, product interest, and purchase intention.

The authors conducted two empirical studies in the field of different product categories. Data were collected from subjects ranged in age from 16 to 50 (n=155 for study 1, n=309 for study 2), and analyzed using independent‐samples t test and univariate analysis of variance (ANOVA).

Results show that subjects rated eWOM articles in blogs with visual information significantly higher in four areas than identical articles without visual information. Furthermore, there is an interaction effect between product category and visual information on product interest and purchase intention. Compared with experience products, when subjects read the eWOM information of search products with pictures (versus without pictures), they would generate greater product interest and purchase intention. In addition, the effect of visual information is stronger not only for search products (no matter whether utilitarian or hedonic products) but also for experience‐hedonic products than for experience‐utilitarian products.

The findings of this study provide useful knowledge for internet marketers to develop effective eWOM marketing and thus increase consumer trust in eWOM and intention to purchase products. Although visual information is found to be important, different product categories should take advantage of visual information in different degrees.

The purpose of this study was to investigate consumer preference formation in presence of reviews coming from traditional and electronic word of mouth (eWOM) under different conditions of review valence.

Scenario-based experimental design was used for this study. A total of 172 respondents were randomly assigned across four experimental scenarios and a control group. Across-groups comparisons were conducted using post hoc Dunnett’s test for checking the hypothesis.

The study revealed that negativity bias impacted consumer judgement formation to such an extent that positive valence from higher credibility source (WOM) is over-powered by negative reviews from lesser trusted source (eWOM). Further, a negative valence review from higher credibility source (WOM) may not be countered even in presence of consensus of positive valence review coming from a higher number of positive eWOM.

This study contributes to existing literature by examining consumer preference behaviour in presence of reviews coming from traditional and eWOM under different conditions of review valence. While earlier studies have examined individual role of WOM and eWOM under differing valence conditions, this paper extends literature by studying combined effect of WOM and eWOM under different review valence.