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by k3n 4925 days ago
Actually they do warn you after the fact -- you should get a "welcome back" email:

    Hey k3n,

    The Facebook account associated with facebook@example.org was recently reactivated.

    If you were not the one who reactivated this account, please visit our Help Center (http://www.facebook.com/help/?topic=security).

    Thanks,
    The Facebook Team