If it's any good, I'm hoping I can play it against/with my Dad. We play Civ IV all the frikkin time when I visit home, but since I don't own a computer that can run the game, we can't play it via that play-by-email function. While I doubt Facebook Civ will be much of an alternative, it IS an alternative none the less.
At least till I finally upgrade to something that I can play the real thing against him on.