I assume this issue is covered extensively in other threads but I wanted to give my explicit issue as it may not be.
I signed up to Spotify about a year or so ago but never used it. I have now signed up for a premium account and am completely loving it with no issues whatsoever.
My only gripe is that I have friends on Facebook that use Spotify but don't show in my friends list and I can't seem to understand why this is and how to add them manually. I only use Spotify on my iPhone 5 and iPad. Also if I decide to stop having a Facebook account will this cause my Spotify account to cease?