I find it hilarious how people continue to cry out in shock every time that Facebook does something to them.
Guess what?
You fell for it, it's too late now.
Facebook regularly 'updates' its privacy settings, which, if you kept your profile at maximum privacy becomes a problem since it'll use that as an excuse to reset your settings to public. If your friends tag you, they never let go of that information. If you go to delete your account, simply deleting it isn't enough; Facebook determines that you merely want to deactivate it, so they hold onto your entire account to reactivate it whenever you return. You have to dig through their FAQ for the actual deletion, which then keeps your account for two weeks and reactivates it if you check back in during that time. By then, it's safe to assume that they mined out whatever data you had.
As an experiment, I created two Facebook accounts. The first one I kept my name fake, as well as my info, yet once one of my friends was added it pretty much pinned down everything about me because my friends tagged me under my real name. I fully deleted that one. The other one I put at maximum privacy and used to just check the dining hall schedule at my college. Well, surprise, surprise, I have tons of friend invites from relatives and friends who simply searched and found me, despite that supposedly being impossible with my privacy settings.
I found it hilarious, because I wasn't like the majority, who plaster every single picture, feeling, relationship, and bowel movement to Facebook. You're never getting disentangled, and no matter how much you cry out every single time that Facebook again does something with your privacy, you'll never stop using it.
Again, this was a set of IMs from right after Facebook was released:
Zuck: Yeah so if you ever need info about anyone at Harvard
Zuck: Just ask.
Zuck: I have over 4,000 emails, pictures, addresses, SNS
[Redacted Friend's Name]: What? How'd you manage that one?
Zuck: People just submitted it.
Zuck: I don't know why.
Zuck: They "trust me"
Zuck: Dumb fucks.
He doesn't give a flying fuck about privacy, especially not since you're flinging it at him and he makes money off of selling that to advertisers. So, if you're using his product, it's a little bit too late to be offended when he abuses you. You're not his customer, after all; you're his product, and he's just making it easier for his data-mining customers to get what they wanted.