Despite the increasing interest in celebrity influencers as a marketing communication tool, much remains to be explored to understand how influencer credibility combined with brand credibility affects consumers’ perception toward the influencer promotional post. Moreover, there are growing concerns around whether sponsorship disclosure on influencer promotional posts encourages consumers to critically process the advertising message. Thus, this study examines the effects of disclosure types (explicit/implicit/no disclosure), influencer credibility (high low), and brand credibility (high/low) on the effectiveness of Instagram influencer promotional posts. Findings reveal that highly credible brands featured in Instagram posts have a positive impact on message credibility, attitude toward the ad, purchase intention, and eWOM intention. Theoretical and managerial implications are discussed.
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