This strikes me as an unwise move on Spotify's part. Allowing integration with Facebook as they had before was fine. But forcing people to sign up with a Facebook account? Not only are they eliminating a large group of people who would like to sign up and don't have a Facebook account, but they're also tying their fate as a company to a third-party.

I have a feeling that this was a condition that Facebook insisted on in return for Spotify being used for Facebook Music. I hope the deal turns out to be worth it.

I seem to recall a post where they said that people who linked their Facebook accounts bought and share more music. And as a result of the deep integration with Facebook, they'll probably have a sharp increase in their growth.

I just hope that this is a temporary condition and that they eventually allow other methods of signing up. Otherwise, they might as well just be acquired by Facebook.