Spotify Adds Group Playlists Using Facebook Messenger
They can create a Group Playlist, share it, and add songs directly within the Messenger app using the SpotifyChat Extension. Once a friend has created a Group Playlist, others in the conversation can add more songs directly through the SpotifyChat Extension, available by tapping the blue “+” icon next to the composer — even if they’re not on Spotify.
You can see it in action at http://m.me/Spotify.
TIP: Musicians could start a themed playlist and encourage fans to add to it.