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How would you "quickly undo" an action that defriends everybody?

That would be a pretty bad joke but it someone doesn't sign out of their Facebook or email account on a share computer, they kind of deserve it.

Why on Earth would someone deserve to lose all their friends because they accidentally didn't log out on a shared computer?

That button was actually just a joke; it brought up an alert saying "Come on, you can't really be that mean!"