Facebook shoots, ignores questions; account lock-out attack works
Found on Ars Technica on Thursday, 28 April 2011

Got enemies on Facebook? Facebook is so eager to protect copyright that the mere accusation of copyright infringement is enough to get an account locked.
Prior to the account lockout, we had received no notices of infringement or warnings. Truly, we awoke to find that Facebook had summoned a judge, jury, and executioner and carried out its swift brand of McJustice all without bothering to let us know that there was even a problem.
That's what one gets for relying on a single service. Invest a little time and keep track of your friends, and keep backups. So even if Facebook shuts you down for no reason, you still have your contacts offline; and yes, emailing is still a way to communicate.