Activision Publishing has announced a new iPhone and iPod touch version of the popular music-playing game Guitar Hero. The object of the game is to play along with different music tracks, and to keep the fans happy by not missing a lot of notes. This can be done by synchronizing the playerÃs taps with the buttons that appear on the screen, at the proper time. Features include a customizable 3D rockstar, Integrated Facebook support for sharing scores, and the ability to share images to friends via Photo Booth.