On we:fm you listen to music together, at the same time, with friends. Connect your Spotify account, find your friends, and listen. While listening together in the same station, you can chat, save songs and more!
It’s cool to listen together: knowing the others in the stations are listening to the exact same part of the song.
Intersect.Ninja is a site that finds intersections between your Spotify playlists and your friends' public Spotify playlists, so you can see which songs and artists you all like!
The site is 100% open-source and your playlist data is processed completely by your browser, on your own device.