Spotify appears to be working on a "Social Listening" feature that will let multiple users control a playlist from separate devices. They'll also be able to listen to the same songs in real-time. The company hasn't announced the added capability yet, but researcher Jane Manchun Wong spotted a prototype and shared images on Twitter -- where she's previously leaked other updates. The group DJ feature could work like Dubtrack.fm and the former Turntable.fm. It will likely allow users to listen to the same songs while they're apart or collaborate on a playlist when they're together.