At this point, it’s pretty much a given that Facebook will be launching its Facebook Music platform at its f8 developer conference, which takes place Thursday. We’ve been hearing about this for months, with rumors that the social network was teaming up with Spotify for the music platform in May. Last month, it was suggested that MOG and Rdio have joined Spotify as initial launch partners.

More specific details about Facebook Music (as it’s likely to be called) have been thin on the ground. That is, until a Facebook employee named Ji Lee slipped up by revealing a key feature of the music platform. He tweeted, “The “Listen with your friend” feature in ticker is blowing my mind. Listen to what your friends are listening. LIVE.”

Lee quickly realized his mistake and deleted the tweet, but not before another Twitter user was able to take a screenshot of the tweet.

This seems like it will be a pretty cool feature. We reported back in June that you would be able to see what your friends are listening to in the new ticker (which was then being tested among a limited number of users) and this slip up gives a little extra confirmation that this will indeed be the case. Being able to listen to the same songs as your friends at the same time is a fascinating move by Facebook.

TechCrunch noted that Lee left the following status on his Facebook profile, which also suggests that Lee is already using Facebook Music, “Ji Lee is listening to Black & Blue by Mike Snow and feeling happy it’s another beautiful sunny day in California.”

Meanwhile, it seems that Facebook will not have a universal music control — Facebook Music will likely be more of a sharing platform and is apparently not hosting any of the music itself. It was reported that you would be able to control the music being played on one of the partner services from Facebook itself (with play, pause, stop and track skip buttons, for instance) but it seems that you will have to change windows to the music partner (Spotify, MOG, Rdio, etc) you’re playing music from in order to control what you’re listening to. In any case, we’re only a few hours away from finding out what Facebook has up its sleeve for Facebook Music.