I predict that Facebook will continue to push the limits of privacy violations, and will back off only when the outcry is so widespread that they're in danger of losing users.
Beacon led me to consider deleting my Facebook account (I wasn't using it much anyway). Then I realized there is no easy way to delete one's Facebook account (deactivating your account doesnt really do much).
I did manage to find a way to delete my account (a hack really and it took some Googling).
