Social DJ apps have always had a strange place in the internet's heart. Turntable.fm was beloved while it was around, but plug.dj never fully succeeded it in popularity when it took up the mantle. Still, Qcast aims to bring that excellent idea — group music parties — to your TV via the Chromecast.
The app streams your music from a Play Music subscription to your television. Anyone with an Android phone and a Play Music library can jump in and add songs to the playlist. Listeners can up or down vote songs to determine whether a song continues or is skipped.
It's still somewhat limited in that in addition to a Chromecast, you need party guests who all have the app installed and music in Google Play (sorry Spotify, Rdio, or iTunes users), but for those who qualify, it's a great way to liven up a party.