Social Media Influencer Trust Drives Purchase Intent: Meta-Analysis of 31,000 Participants Reveals Key Factors

A new meta-analysis published in the International Journal of Internet Marketing and Advertising synthesizes empirical studies involving over 31,000 participants to identify what makes social media influencers effective. The research finds that credibility, expertise, attractiveness, and perceived similarity to followers are positively associated with consumer attitudes toward promoted brands and, subsequently, purchasing intentions. This matters because influencer marketing has grown into a multibillion-dollar industry, yet brands often struggle to measure ROI and select the right partners. By pinpointing these trust-related factors, the study provides a framework for marketers to evaluate influencer partnerships beyond mere follower counts. The findings also highlight the evolving nature of consumer trust in the digital age, where parasocial relationships can rival traditional advertising. As algorithms and platforms change, understanding these psychological drivers will be crucial for brands aiming to convert attention into sales. The takeaway: authenticity and relatability are no longer optional—they are the currency of influence.