If you're less worried about Facebook holding your personal information and more worried about your average Joe getting hold of it, then the easiest thing to do is either:


A) Delete your account, set up a new one with minimal info, re-add your friends
B) Go back and manually delete all your previous posts


Both of these are time-consuming and annoying, but probably the closest you'll get to your goal. Like everyone's said already, if you have a FB you're already bending over at their command. The FB bods won't delete your past posts for you, you'll have to do it yourself.