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Apple should build some Facebook connec right into the iPhone and ipad os (or create a competing social repository). Part of the popularity of facebook games (and xbox ones) is that they allow you to compete with friends with a centralized database of user icons and scores. Farmville and mafia wars wouldn't be as popular if I couldn't see a cousin or friend's score to compete with.
So are you one of those that makes all of your friends get the constant invites from those games.............You know they hate that right?