Spotify allows friends to share free – legal! – music. By downloading the Spotify app, you can listen to music while cruising through Facebook, as well as tap into what your friends are listening to via a ticker that will show up on the right side of your profile. Listen to your favorite band, chat with friends, and browse Facebook to your heart’s content, all without navigating away from the social network.

Spotify
The Spotify Facebook app allows users to look at what their Facebook friends have been listening to and compares musical tastes among them.