Purpose Health and fitness influencers who directly affect one’s well-being through their messages create situations of vulnerability that require trust. To understand the various dimensions of trust, this study integrated a typology of trust into source credibility theory. The purpose of the study is to explore the typology’s four trust dimensions concomitant with the perceived attractiveness and expertise of such influencers to identify consumers’ attitudes toward micro-health and fitness influencers. Design/methodology/approach This study used a manipulated-stimuli online survey and gathered 414 micro-influencer evaluations. Variance-based structural equation modeling was used to analyze the data. Findings The results supported the four of trust building. However, a less complex trust formation process was revealed, thereby contrasting the original trust theory formulation. Specifically, the effect of disposition to trust on institution-based trust was higher for regular than for heavy social media users. Also, compared to regular social media users, trusting intentions had a greater impact on heavy social media users’ attitudes toward micro-influencers. In addition, the effect of institution-based trust on trusting beliefs was higher for older than for younger participants. Furthermore, placement of congruent compared to noncongruent products created differences in perceived attitudes toward micro-influencers. In particular, disposition to trust had a larger effect on institution-based trust for noncongruent than for congruent product placements. Originality/value This study extended source credibility theory by including alternative trust dimensions – notably, non-situation-specific disposition to trust and institution-based trust, as well as situation-specific trusting beliefs and trusting intentions – into source credibility.
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