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The purpose of this paper is to test the effects of two types of celebrities (Instagram celebrity vs traditional celebrity) on source trustworthiness, brand attitude, envy and social presence. The proposed theoretical model consists of the celebrity type as the independent variable, social presence as the mediator and self-discrepancy as the moderator.

A randomized two-group comparison (Instagram celebrity vs traditional celebrity) between-subjects experiment (n=104) was conducted.

The results indicate that consumers exposed to Instagram celebrity’s brand posts perceive the source to be more trustworthy, show more positive attitude toward the endorsed brand, feel stronger social presence and feel more envious of the source than those consumers exposed to traditional celebrity’s brand posts. Structural equation modeling (Mplus 8.0) and bootstrap confidence intervals indicate that social presence mediates the causal effects of celebrity type on trustworthiness, brand attitude and envy. Multiple regression analyses reveal the moderating effects of appearance-related actual–ideal self-discrepancy.

Ultimately, managerial implications for social media marketing and Instagram influencer-based branding are provided. From the perspective of marketing planning, the findings speak to the power of influencer marketing as an effective branding strategy.

The paper discusses theoretical implications for the marketing literature on celebrity endorsements.

Social media campaigns by fashion brands typically rely on two types of accounts: official brands' accounts and social media influencers' accounts. The current study investigates relevant mechanisms that explain the effectiveness of Instagram posts contingent upon their account types (commercial brand's Instagram account versus influencer's Instagram account) and content types (the absence versus presence of human figures in the posted contents).

Conducting an online experiment (N Females = 195), it was tested if parasocial interaction (PSI) and feelings of social presence moderate the effects of Instagram accounts' promotional posts on consumers' perceived trustworthiness of the endorsed fashion brand. The experiment employed a 2 (Type of Instagram posts: product-only posts versus product posts with a person content) × 2 (Type of Instagram account: a fashion-brand account versus a a fashion-influencer account) between-subjects factorial design.

Results demonstrate three-way interaction effects among the type of the Instagram account, the type of Instagram posts and PSI/social presence on the perceived trustworthiness of a brand. When the content is coming from a fashion-influencer account, there is no difference between product posts with a person and product-only posts conditions with regard to the positive relationship between PSI/social presence and trustworthiness. In contrast, when the source is a fashion-brand account on Instagram, the positive relationship between PSI/social presence and trustworthiness is stronger for product posts with a person. These findings suggest that Instagram posts that are promoted by fashion influencers would have similar effects of PSI and social presence, even if they do not appear themselves in the branded content.

This research contributes to our understanding of the effective antecedents of trustworthiness in social media-based fashion marketing and fashion brand management. Instagram account types and content types influence the extent to which social media communication allows for the formation of emotional ties with and positive evaluation of the fashion brand.

In light of Facebook-based viral marketing and social commerce, the purpose of this paper is to test the moderating role of social identification with the Facebook profile owner (celebrity as aspirational reference group vs ingroup member (college student, same school) vs outgroup member (college student, different school)) in Facebook-based fashion brand marketing and management.

A randomized between-subjects experiment (celebrity’s Facebook profile vs ingroup member’s Facebook profile vs outgroup member’s Facebook profile vs control condition, n=73) was conducted. The sample was composed of college students recruited from a subject pool in a US university.

Results of multiple regression analyses indicate that social identification with the Facebook profile owner and ingroup vs outgroup perception moderate the influence of consumers’ materialism, fashion involvement and opinion leadership on interpersonal attraction to the celebrity, wishful identification with the celebrity, emotional quotient, involvement with the ads, advertising believability and willingness to buy the advertised fashion products. Furthermore, the results of structural equation modeling analyses show that source credibility perception (both the celebrity who endorses her own brand and the Facebook profile owner) mediates the relationship between experimental conditions (celebrity as aspirational outgroup vs same school student as an ingroup member vs different school student as an outgroup member) and the outcome variables (interpersonal attraction to the celebrity, involvement with ads, and advertising believability) in viral marketing leveraging a social media platform.

This study makes several theoretical contributions to consumer psychology and provides managerial implications for Facebook-based fashion marketing and fashion brand management.

Luxury fashion brands harness the power of Instagram and fashionistas for strategic brand management. This study aims to test interaction effects among luxury brand posts’ Instagram source type (brand versus fashionista), visual image type (product-centric versus consumer-centric) and consumers’ characteristics (vanity, opinion leadership and fashion consciousness) on brand recognition and trust.

A quantitative 2 (source type: brand versus fashionista) × 2 (branded visual image type: product-centric luxury versus consumer-centric luxury) between-subjects online experiment (N males = 195 and N females = 182) was conducted by recruiting participants from MTurk.

Logistic regression analyses indicated two-way interaction effects between sources and visual images on brand recognition. Brand recognition was higher for product-centric images when the source was the fashionista, whereas brand recognition was equivalent regardless of the image type when the source was the brand. Logistic regression and multiple regression analyses revealed the moderating effects of sources and visual images on the association between consumer traits and branding outcomes.

Meticulously choosing effective methods of showcasing branded content and persuasive luxury visual image strategies via Instagram is more important for fashionistas than for established brands in increasing brand recognition. Instagram fashionistas are more effective in increasing females’ brand trust through delivering product-centric visual images when targeting women with high vanity, opinion leadership and fashion consciousness. Brands as the Instagram profile source are more persuasive in increasing males’ brand trust through delivering product-centric visual images when targeting men with high vanity.

This experiment provides theoretical discussions and empirical findings about social media influencer marketing and managerial implications for Instagram-based luxury branding. This research revolves around the overarching theme of the interactive effects of multifaceted branded contents and market segments in social media influencer marketing environments.