This document summarizes a study into the motivations behind why people share content online. The study used ethnographies, interviews, and a survey to identify six personas of online sharers (Altruists, Careerists, Hipsters, Boomerangs, Connectors, Selectives) defined by their emotional motivations and values. Key findings were that sharing helps people connect with others, manage information, and fulfill emotional needs like feeling involved or validated. The document outlines guidelines for marketers to appeal to these motivations like building trust, keeping messages simple, and responding to shared content.