I have the same problem. I previously had a spotify account with a premium subscription. I clicked on a link on Facebook, which made spotify to open. I have been requested to login on spotify using my Facebook account, which worked. But then I cannot login to my previous Spotify account. The new account, linked to Facebook did not retreive neither of my playlists nor subscription. Is this normal, and just have to way a couple of hour to have both accounts completely merged ?