Tapulous (purchased by Disney earlier this year) has released Tap Tap Revenge 4, the fourth iteration of the extremely popular iOS music game, and the new version brings a whole lot of new features to the series. The game is now compatible with the Retina Display, now includes Game Center integration, and has quite a few new social modes that let you "like" various songs, as well as see which of your friends has also "liked" that same music. Like Tap Tap 3, it's a free app that sells music packs and avatars as in-app purchases, with music from artists in all genres, from Li
