This Twitter app is so bonkers, I don't even know where to begin. *deep breath* OK, so it has MONSTERS and like POKEMON, your monsters ATTACK your followers' monsters and... oh god, I miss the days of Twitter SMS.
The app itself is a free download, but you can pay for monster eggs inside the game for a buck each. It's your duty to raise your egg, nurturing it by tapping on it or tweeting. Once the monster pops out of the egg, it starts attacking areas within your location (via Google Maps, naturally), every five minutes. If your monster gets attacked though, be prepared for some tears and lost points.