This document discusses the rise of influencer marketing on social media platforms. It notes that millennials spend more time watching YouTube videos than traditional TV, and are influenced more by recommendations from influencers than traditional advertising. Influencer marketing involves content creators promoting brands and products organically to their large online audiences. While this can be an effective marketing tactic, issues around disclosure of sponsorships and maintaining authenticity have arisen. The relationship between brands and influencers has evolved from initial pay-per-post deals to more collaborative partnerships. Platforms have also emerged to connect smaller brands with relevant influencers. Future research may examine finding the right balance of influencer promotions to avoid oversaturation.