I realize there are all kinds of GDPR hurdles that would need to be overcome, but it would be SO cool to have an option to opt in to be connected with your music twin i.e. a spotify user that listsens to and likes the most similar amount of music to you. And then you could be notified when they like a new song, or listen to a new album and you could even chat with them.
Just a shot in the dark. But thought it could be fun!