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Previous research concerning relevant source characteristics has often confounded source expertise and source experience. This study examines whether these two source attributes have differential effects on consumer attitudes. A laboratory study based on a 2 (high/low expertise) 2 (high/low experience) factorial design was conducted. The results indicate that: consumers can distinguish between endorser expertise and experience; information communicated by an endorser high in expertise as compared to one low in expertise leads to more positive attitudes toward the endorser and the advertisement; and even though consumers can discriminate between low and high experience endorsers, no effects on attitudes toward the endorser and the advertisement can be shown. Since it seems to be more difficult for consumers to assess experience than expertise and consumers seem to discount an experienced source as being too subjective and/or not knowledgeable enough, choosing an expert endorser might be more effective for certain target markets.

The purpose of this paper is to explore different types of source expertise and how they influence perceived message quality. Consumers face the challenge to identify valuable online reviews. Source expertise as a signal of message quality can be displayed differently, depending on website layout, operator and review author.

Two scenario-based experiments were conducted questioning 135 and 275 participants. They investigate the effect of different types of expert reviewers on perceived message quality and also examine the interplay of source expertise and source trustworthiness.

The findings reveal that the different types of expert reviewers differ in perceived expertise and their impact on perceived message quality. Claims of expertise induce the highest perceived expertise compared to the other expert types and non-experts, but are perceived as less trustworthy.

Future research should examine the influence of the expert types across different product and service categories and could also include moderating influences that reflect how consumers process expert cues differently.

Cues that signal high expertise and high trustworthiness are likely to deliver the most valuable online reviews. This should be incorporated in the website's layout to help consumers find valuable information.

The approach of this research is novel in that it undertakes comparisons between three types of expert cues and non-experts. It also addresses the interplay of source expertise and trustworthiness and examines the effect on message quality.

This study examines the use of high-expertise sources such as doctors to sell dietary supplements and the use of skeptical statements toward approved drugs in the act of selling dietary supplements.

The research questions are addressed by means of a scenario experiment that manipulated two independent variables: expertise (high- vs low-expertise) and skepticism toward prescription drugs (present vs absent).

Surprisingly, skeptical statements from a low-expertise source toward a prescription drug made while selling dietary supplements was found to have an insignificant effect on selling effectiveness (willingness to recommend and perceived product effectiveness). However, when a high-expertise source (doctor) did the same, selling effectiveness was reduced.

The paper identifies a boundary condition for competitive selling claims of dietary supplements. Doctors are likely to get away with claims regarding the efficacy of dietary supplements until they criticize a more credible prescription drug in favor of supplements.

Claims made by a low-expertise sources and high-expertise sources in the act of selling dietary supplements must be carefully considered. Conventional wisdom tactics may be ineffective.

This paper uniquely demonstrates the role of competitive skepticism at different levels of expertise. The findings of this study suggest that managers, in especially the multi-level marketing industry, should reconsider some of their selling tactics.

Considering the growth of the at-home smart technology industry and the increasing power of social media influencers, this study aims to examine how influencer endorsements affect individuals’ attitudes and trial intentions toward smart technology products.

An online experiment was conducted to investigate the impact of follower number and expertise domain of influencers and the trust propensity of individuals on their attitudinal and behavioral responses to influencer endorsements of smart technology products. The moderated mediation effect of perceived credibility was further examined.

The results demonstrated that individuals with lower trust propensity responded more positively to a microinfluencer with fewer followers and a specific area of expertise, which led to favorable attitudes and increased intention to try a smart technology product. However, the expertise domain was not a significant factor for the megainfluencer condition with a more extensive follower base. Interestingly, the interaction effects were not observed for individuals with higher trust propensity.

The results of this research provide practical implications for marketers who look for effective strategies for influencer marketing by demonstrating the significant impact of source-related cues, including follower number and expertise domain.

Based on the modality, agency, interactivity and navigability; source credibility; and persuasion knowledge models, this research explains how source-related cues of influencers affect credibility judgment, attitude formation and trial intentions for new technology products and how trust propensity as a personal dispositional factor varies the relationship.

This research was designed to expand the understanding of how brand familiarity may affect the motivation to process word-of-mouth (WOM) information in brand evaluation. The pre-WOM brand attitude certainty is expected to explain the moderation effect. The paper aims to discuss these issues.

Two experiments were conducted. The study participants were undergraduate students from a major university in Singapore. The main statistical analysis was done using a two-way analysis of covariance.

The results of Experiments 1 and 2 support the prediction that consumers are more likely to use the perceived expertise of the WOM sender to evaluate an unfamiliar brand vs a familiar brand. Experiment 2 also provides some preliminary evidence that this interaction effect may be due to the difference in certainty of the study respondents in regards to the pre-WOM evaluation of unfamiliar and familiar brand.

This manipulation method of presenting WOM in a printed format may understate the impact of WOM. A more vivid manipulation of WOM that allows for a feedback loop may be considered for future research.

The results highlight the importance of considering the strength dimensions of brand attitudes (e.g. attitude certainty) in the marketplace. For marketers of unfamiliar brands, source factors (e.g. expertise of WOM sender) are important to consider for effective use of WOM to market their products. For familiar brands, source factors are less relevant.

This paper highlights the importance of considering attitude certainty and the subsequent malleability of attitude toward new information about the brand in the marketplace. Hence, marketers and researchers who are interested in changing brand attitude should take meta-attitude factors into consideration.

The purpose of this paper is to examine the causal relationship between interactive and personal campaigning on social media and political involvement, and the mechanisms that explain the effects. Specifically, this study examines whether personal and interactive communication on Twitter increases political involvement among citizens through social presence and perceived expertise.

An experimental design – a 2 (low vs high interactivity)×3 (depersonalized vs individualized vs privatized communication) between-subjects design – is used.

The findings show that interactive communication leads to a stronger sense of social presence and source expertise, which positively affect involvement. The effects of personal campaigning differ. Individualized communication positively affects involvement via source expertise. Interestingly, privatized communication positively affects involvement via social presence, but negatively via source expertise.

Although a growing body of work examines the political consequences of social media, there is still very little understanding why social media affect citizens. The current study fills this void by investigating how the use of social media affects political involvement among citizens.

This research examines the underlying psychological process of customers' impulsive buying on social media through the lens of customer inspiration. Drawing on the customer inspiration theory, it identifies the factors influencing customer inspiration on social media from three perspectives: source characteristics, platform characteristics and personal characteristics, which subsequently lead to impulsive buying. Since the conceptualization of source credibility includes three mostly reported components: attractiveness, expertise and trustworthiness, it further contrasts the effects of three dimensions of source credibility on customer inspiration.

A structural equation model of customers' impulsive buying on social media was developed through the lens of customer inspiration. An online survey with 625 participants was conducted to test the hypotheses, and the partial least squares (PLS3) method was used.

This research found that source credibility, social presence and customer innovativeness are antecedents of customer inspiration on social media, which positively influence the inspired-by state of the customers, which impacts the inspired-to state and further leads to impulsive buying. By comparing the three dimensions of source credibility, the authors found that attractiveness and expertise positively affect the inspired-by state, while trustworthiness has no significant effect.

This research establishes the link between impulsive buying and customer inspiration, which provides a new psychological perspective to understand impulsive buying. In addition, it investigates the source characteristics of customer inspiration by comparing the effect of three dimensions of source credibility on customer inspiration, which provides the first evidence for connecting customer inspiration and source credibility.

The importance of influencer marketing is constantly growing. However, little empirical research has examined influencers’ success requirements. This study aims to fill this gap by exploring whether the requirements of influencers’ attractiveness, expertise and trustworthiness are relevant for online influencer campaigns. An entry-level luxury fashion brand is the focus of the experiment.

A total of 288 participants completed an online survey evaluating the profiles of influencers who varied in terms of the three abovementioned requirements. The impacts of these requirements on brand image, brand satisfaction and brand trust as well as purchase intention and price premium were tested via structural equation modeling.

The results show that the most important requirement is trustworthiness, followed by attractiveness; surprisingly, the relevance of expertise is virtually nil.

To date, practitioners are still struggling with the success requirements of influencer marketing. They have focused on traditional advertising models and numeric requirements such as the amount of followers. However, regarding merely these requirements can result in wrong decisions. Considering the two requirements, attractiveness and trustworthiness, in a stronger way can provide a remedy to this struggle. In future research, the relevance of the requirements in different involvement conditions and for non-attractiveness-related products might be investigated.

To the best of the authors’ knowledge, this study is one of the first to explore the success requirements that are directly related to influencers (e.g. attractiveness) rather than numeric requirements of their profiles (e.g. page rank) and the impacts of those requirements on brand image, brand satisfaction and brand trust as well as purchase intention and price premium. It adapts the Source-Credibility Model for influencers and shows that its requirements interact in a unique way that is counterintuitive and different from other endorser types such as celebrities or salespersons.

The purpose is to evaluate the effect of positive and negative traditional word-of-mouth (PWOM and NWOM) on price-based quality perceptions of middle-range wine (price comprised between US$4 and US$12), considering the moderator role of type of relationship between source and receiver –in terms of the strength-of-tie – and the wine expertise of the source.

A between-subjects experimental design was employed to test the hypotheses. The dependent variable, perceived quality, was analysed using analysis of variance (ANOVA) and independent samples t-tests.

(1) WOM significantly affects price-based wine quality perceptions only when the source is perceived as expert, and independently on the type of relationship between source and receiver. (2) WOM has no “additive effect” on price-based quality perceptions for all but one condition (PWOM about high-priced wine from a close and expert source). (3) WOM results more useful than price to assess quality mainly in “contradictory” situations.

The main limitation is related to the fact that is an experiment, specifically the manipulation of strength-of-tie and source expertise. Although manipulation checks show good results for the procedure, future research should try to design better ways to manipulate these variables, or different procedures to capture similar data.

Managerial efforts aimed to the encouragement of PWOM will be more efficient in markets with a high proportion of experts. Also, the marketing strategy of stimulating PWOM would be more effective for wines in the low-price category.

This study contributes to understand the impact of WOM on wine quality perceptions by examining if WOM affects priors price-based quality perceptions. In particular, we determine if price-based quality perceptions are able to be modified by PWOM and NWOM, a “competing” approach that is novel within the wine literature in which price is usually the most used cue to elaborate quality perceptions.

Word-of-mouth (WOM) literature has identified the roles of source and message in WOM influence, but the relationship between them is yet to be investigated. The purpose of this paper is to explore this relationship by examining the mediation of message on the impact of perceived source characteristics from the perspective of the receiver. The paper also considered the mutual relationships between source characteristics and message quality.

A quantitative survey of prospective students was conducted to empirically examine the proposed conceptual model. A sample of 509 respondents was analysed using structural equation modelling.

The findings suggest the significant impact of expertise, trustworthiness, homophily and opinion leadership of the WOM source on the judgement of message quality and the indirect effects on WOM influence mediated by the message quality. The results also indicate the moderating effects of receiver involvement and the valence of the message on the impact of message quality.

The findings of this paper can inform the strategic development of WOM marketing. A deeper understanding of source characteristics and the role of the message may enable marketing practitioners to better target appropriate influencers for seeding programmes that stimulate WOM communication about their brands or products.

This study examines how the receiver’s evaluations of message content mediate the relationship between source characteristics and WOM influence. Source and message are two elements of communication which are processed when people receive information. However, nascent research examines their effects on each other. This research contributes to the understanding of this relationship through an empirical examination of the direct effects of primary source characteristics on perceived message quality.