Log in with facebook
If you used Facebook to create your Spotify account, please follow these steps to log into Spotify:
Head to https://www.spotify.com/us/
Click on “Spotify for free” (if you want to use the free version)
Select 'Login' to open the Spotify app web view
Select 'Log in with Facebook'
When prompted with 'Log into your Facebook account to connect to Spotify', enter your FB email and password, then select 'Log In'
Now, you can continue using your Spotify account.