The biggest service integrations highlighted were Spotify, but Turntable.fm, Rhapsody, Soundcloud and plenty of others received nods for integration.
Facebook's plan is to show users your friends' activity in the newly launched "ticker bar" on the right of your Facebook account. Once you enable the app into your Facebook account, clicking on a song will allow you to open it in the app your friend is sharing it with.
You can integrate your favorite music streaming service in any way you see fit, or disable it completely. If you're using Spotify, for instance, you can allow every song you're playing to pop up in the feed on the left -- it won't integrate into your news feed, but it will allow friends to see what you're listening to and hopefully discover new music.
If a friend happens to spot this at the same time you're listening, you can listen to the song together and talk about it in a separate area.
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