This document provides an overview of social audience marketing, which takes a systematic approach to identifying, encouraging, and targeting a brand's social audience through earned media. It discusses how earned media can amplify the impact of paid and owned media by reaching new potential customers through social sharing. However, competing for user attention and diluted trust present challenges. The social audience marketing approach uses tagging and tracing technology to track sharing across social networks and identify influential brand advocates and the extended social audience they reach. It then provides tools to activate and recognize key influencers in order to encourage further sharing.