This document provides an introduction to Facebook and Twitter, including statistics on their popularity and usage. Facebook has over 300 million active users, with 50% logging on daily. People upload over 2 billion photos and share over 2 billion pieces of content each week. Twitter sees over 3 million tweets per day, and had over 18 million US adult users in 2009. The document discusses how individuals and businesses can create accounts and engage with others on both platforms.