A report in the Wall Street Journal indicates that the Facebook, along with MySpace, Digg, and a handful of other social-networking sites, have been sharing users' personal data with advertisers without users' knowledge or consent.
The data shared includes names, user IDs, and other information sufficient to enable ad companies such as the Google-owned DoubleClick to identify distinct user profiles.
via arstechnica.com
If facebook weren't such a great tool to keep in contact with friends and family, I'd leave immediately. Even with that, I'm tempted more & more each day to migrate away from it. Their privacy record isn't something to be proud of...