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Sonific now has a Facebook application. It works just as your regular Sonific account does, letting you listen to playlists, search for new artists, create your own playlists and share them with friends. Artists can add their own music to the Facebook app, though they will have to be approved by Sonific first.
The Facebook app is separate from your outside Sonific account, so there's no synch ups here. Playlists created within the app will stay there, and vice versa. Sonific also launched its API a few weeks back.