When Apple made the ruthless decision to remove Google maps on its iPhone, at least someone saw the silver lining. And that someone is Facebook. According to ComScore, Facebook is now the number one mobile app, a position that Google had held before September. The most recent data shows Facebook had 85,574 unique visitors in December, while Google only saw 74,631. The position might be short-lived for Facebook, as Google maps is now back in the game.  [Source: ComScore]