I first heard about Whyd, the France-based musical social media network last fall. I wanted to try it but I never made it into the private beta. Now, though, Whyd is open to everyone.
Basically, Whyd allows members to organize tracks from everywhere online (including YouTube, Soundcloud and Deezer) and then to create connections with friends another members.
Mashable has a deeper look at the service. Watch for the music industry to get really nervous about this one.