Earbits seems really neat. I like the music it played and was excited to start using it. Once I realized that I needed a facebook account and that it would share what I listened to with my facebook friends it wasn't worth it to me. I really don't like the trend of requiring facebook to login to a website.
Facebook required their music partners to eliminate their non-Facebook authentication systems for new users to be promoted in the Facebook ecosystem. It's not really up to the services themselves. Spotify had to do the same thing.
