Just a simple idea, nothing to go in depth about.
But could spotify implent like, similar to snapchat how you can add things by taking the picture of the QR code thingo, But like able to share bands, or even follow other peoples playlists easier.
Even though it won't be something new and amazingly spectacular but it'd be a cool feature to make it a lot easier to share music and stuff around via mobile.
Updated on 2018-01-30
Spotify's relatively new Song Codes work as this idea suggests!
Have a wonderful day. Happy listening 🙂