This document discusses influencer marketing and influencer amplification. It defines influencers as trendsetters with engaged, loyal followers across social media. Influencer marketing is described as an effective marketing channel due to influencers' authenticity, ability to build trust and reach new consumers, and help reduce content creation costs. Influencer amplification is defined as re-sharing influencer content to extend its reach and add things like calls to action and tracking tags. Key performance indicators for measuring influencer marketing campaigns include awareness, engagement, shares, purchases and other metrics. Case studies are also presented.