Yesterday I was driving with my daughters, who both listened on music on their headsets, via Spotify. I noticed them stopping the music every now and then, or swapping headsets for a moment, to share what they listen at the moment. This lead me to thought.
Would it be possible to start a shared synchronized playlist/session, that is playing synchronized across devices/accounts. When opening the playlist/session all listeners would be hearing the same song the same time. So, kind of a radio. session could be shared via a link giving the opportunity to share link to listen only mode or allow link user to act as DJ.
I think this kind of feature would let users be more social over the music and Spotify.