plastick writes "Many of the most popular applications, or "apps," on the social-networking site Facebook Inc. have been transmitting identifying information, in effect, providing access to people's names and, in some cases, their friends' names to dozens of advertising and Internet tracking companies, a Wall Street Journal investigation has found.
"Apps" are pieces of software that let Facebook's 500 million users play games or share common interests with one another. The Journal found that all of the 10 most popular apps on Facebook were transmitting users' IDs to outside companies. The apps, ranked by research company Inside Network Inc. (based on monthly users), include Zynga Game Network Inc.'s FarmVille, with 59 million users, and Texas HoldEm Poker and FrontierVille. Three of the top 10 apps, including FarmVille, also have been transmitting personal information about a user's friends to outside companies."
Link to Original Source