Facebook is the largest social networking site with over 750 million users that provides tools for sharing photos, interacting with friends, and instant messaging. While Facebook contains a vast amount of user data that is valuable to advertisers, it faces the dilemma of how to generate sufficient revenue from advertisements to maintain its infrastructure given the large volume of user-generated content, as well as how to monetize private user information without violating privacy. Facebook addresses this dilemma by offering applications and services like FriendFeed to expand its capabilities and revenue streams.