Here, a really interesting story about facebook privacy.
http://www.mail.com/int/scitech/news/793886-austrian-student-takes-facebook-privacy.html#.1272-stage-set3-1
October 26, 2011 ? VIENNA (AP) ? Max Schrems wasn't sure what he would get when he asked Facebook to send him a record of his personal data from three years of using the site.
What the 24-year-old Austrian law student didn't expect, though, was 1,222 pages of data on a CD. It included chats he had deleted more than a year ago, "pokes" dating back to 2008, invitations to which he had never responded, let alone attended, and hundreds of other details.
http://www.mail.com/int/scitech/news/793886-austrian-student-takes-facebook-privacy.html#.1272-stage-set3-1