Spotify will try to lure you in with a Facebook login, but look for the smaller print to create an account instead. I deleted my Facebook and detangled Spotify from it.... it can be done! I like the flexibility in following/sharing with friends that I choose, without being forced to do so. You can also follow artists to be alerted when they have new releases.
Beware, though. It's highly addictive. One searched song leads to another, then another, and another....I have one playlist that's 24 hours long, and it wasn't hard to assemble
It will also import any songs found on your harddrive.