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Yahoo just jumped on the Facebook train, launching Yahoo! Music Videos for Facebook. A bit like Last.fm, this gets music info from your profile and those of your friends, and displays music videos that match those interests. You can then find videos of similar artists and share them with your Facebook friends.
They may be a little late, however, to catch up with the highly popular iLike application.
See also: Facebook Platform: 30+ Awesome Applications for Facebook