Facebook has launched a new program which will facilitate communications between outside sites. Basically, unless you change your privacy settings, facebook will share your information with other sites like CNN.com or youtube (if you read an article on yahoonews.com, you can click on the "like" button or recommend it to friends). Privacy advocates are upset -- but they probably have something to hide, anyway.
Take a look at some of the lesser-known sites facebook is partnering with.