[Aliantha]

I don't think that's really any different to any other site on the net where you post personal info. Even here on the cellar banned posters still have their content available for others to see, and you can't go back and delete the content if you want to.

On the other hand, you can delete everything off facebook and stop using it. Once it's deleted you're recinding your permission for them to use your content, so surely you'd have a case against them if you ever felt the need, not that I can imagine why it'd be an issue for most people.