Facebook’s recent integration with Spotify will certainly help make the music-streaming service a lot more social, but it seems that users are now required to have a Facebook account to sign-up for the service.
If you visit the sign-up page, you now see this message:

Facebook’s recent integration with Spotify will certainly help make the music-streaming service a lot more social, but it seems that users are now required to have a Facebook account to sign-up for the service.

If you visit the sign-up page, you now see this message: