This study investigates young consumers’ reliance on social media influencers (SMIs) in the context of social commerce. With regard to the four streams of influencer endorsement – influencer credibility, influencer attractiveness, match-up, and meaning transfer – we propose that they can either lead to a direct consumer reliance on SMIs’ suggestions for their purchasing decisions, or that attitudes toward SMIs mediate the relationship. By integrating both directions of partial- and no-attitude mediation, the proposed model explores all associations in order to (...) better understand connections and driving forces between endorsement streams, attitudes, and reliance. We introduce the concept of reliance on SMIs, understood here as the degree to which young individuals base their preferences, lifestyles, and purchasing decisions upon SMIs. A research model was validated by examining 809 young individuals. The results reveal that attitude formation is affected by all four endorsement streams, and fully mediates the relationship between these endorsement streams and young people’s reliance on SMIs. The differentiated reliance levels by gender and age confirm that females and teenagers tend to rely more on SMIs. The current study offers the first evidence for a relationship between the four endorsement streams and reliance on SMIs via attitude formation in the context of social media networking, as well as the association of reliance with sociodemographic characteristics. (shrink)