When you log into the Spotify application, you find that all your account information seems to have disappeared - all playlists, starred list etc have gone. If you are a subscriber, you also find that your account has dropped down to Spotify Free.
This is also most likely to happen to those who created their Spotify account before September 22nd 2011. In other words, those who chose their own Spotify username when they created the account.
The likely explanation for this is that a new Spotify account has been created, using your Facebook login information.
If the above doesn't help, does not apply to you, or if you have created a subscription to Unlimited or Premium on the newly created account, please get in touch with us, using the Customer Support contact form . This will make it easier for us to resolve any problem for you than posting on the forum.
Any further questions, feel free to ask!