Turntable.fm is climbing the charts. According to a story from Betabeat, the Facebook phenom has hit 140,000 active users after just one month. Not a bad showing for a semi-closed beta with a spotty security record.
The popular service effectively combines (free) music-streaming, chat rooms, and voting, all through a Facebook portal. It's similar to Web apps such as Pandora. Turntable.fm allows you to discover new music and create your own custom playlists, only that playlist isn't just for you—you'll share it with other Facebook users in real time.
Add to the exchange a note of gameplay. After you create your DJ avatar, you can create your own room or enter someone else's (if you get overwhelmed there's a randomizer) and interact with other avatars through a chat feature. Each room supports up to five DJs. Take a seat on the stage to share your playlist, created from your own uploads or from the Turntable.fm library.