Facebook today released some stats (http://developers.facebook.com/blog/post/594/) trying to show the success of several of the Open Graph music applications launched at f8. Most of the stats were in percentages, though, which can give a rosy impression of what is actually fairly little growth. For example, it cites that Rdio has seen a "30x increase in new user registrations from Facebook" In reality, the app itself now has grown by just 200 users to reach a tiny 4,000 daily Facebook-logged in users.
Attribution: CNET, ECTNews and TechCrunch.