A friend of mine has this problem. He just signed up for Spotify Premium and connected his Spotify account to his Facebook account as promted. Now, he realises that he really doesn't want his Spotify account to be connected to his real Facebook account since he probably will be sharing the Spotify account with his girlfriend. I didn't want to get in to all the details but I guess I wouldn't like my girlfriend to have access to my Facebook account either.
So, is there any way to switch the Facebook account you currently have connected to your Spotify account to another one, let's say her Facebook account or just create a new one?