How would you "move" all your personal stuff? Write up Zuckerberg and ask him to take it off their servers once you delete your profile?This sentence, when taken completely out of context of this whole story, is genius.
As someone said above, at least Zuckerberg should be scared. Anyone else who is scared of this should move all their personal stuff to google+ or back to myspace from whence it came, since no massive group will organize an attack on myspace. I'm assuming that making your profile "private" or "friends only" and NOT ADDING STRANGERS would be the first precaution you should take if you plan to keep your stuff up, but I wouldn't doubt they'd get past that.