Imagine if you walked in to NSA 20 years ago and said I'll make a software that millions and millions of people will use to list all their friends, where they have been what they have done where they have gone where they want to go what they want to do, what they are thinking, photos of themselves, family, children, wife, husband, everything, they'll just go there every day and update this information .... you'd have gotten kicked out ... fast forward and tada! "Facebook! I use it because everyone else does" .... honestly from a surveillance point of view Facebook is the holy grail ... I can just imagine them shouting ... Facebook ... jackpot!