Social music service turntable.fm has released an iOS app allowing users to become a virtual DJ and play music with other online users. Tied into the online web service of the same name that was launched earlier this year, the iPhone app provides access to a variety of virtual rooms where users can chat with and listen to music from other turntable.fm members and vote songs up or down. Users can sit back and listen to songs selected by other members or take turns playing their own selections which can be commented and voted on by others. The app includes Facebook integration and as with the web service, new users need to be connected to Facebook friends who are already using the service in order to sign up. The Turntable.fm service and app are available only within the U.S. at this time, the app is a free download from the U.S. App Store.