This document provides an introduction to the publication "Person-to-Person-to-Person: Harnessing the Political Power of Social Networks and User-Generated Content". It discusses how social networking sites like MySpace and YouTube have become very popular in engaging users to share content. The publication aims to provide guidance to political campaigns and organizations on incorporating social networking and user-generated content into their strategies. It features advice from experts on building online communities, encouraging offline participation, and blending online and offline networking. The introduction discusses key concepts around social networks and provides a high-level overview of the topics and tactics covered in the various chapters.