Years ago I opened a facebook account (can't remember why now) with an obviously fictitious name (Fred Flintstone) and an email account that I use for miscellaneous shit like this. I think I've only ever logged on the once. I get emails all the time from them do you know blah blah blah? Just recently though the emails mention people that I do actually know. I've never told them I've got a facebook account. The thing these people have in common is that I know them from a mailing list I subscribe to. I use my real name on this list. But as far as I can remember I never gave my real name to FB. So how the fuck do they know?