It would be advantageous to be able to share music with your mutual followers within the application. Beyond that, being able to see who follows your playlists would be great. The collaberative playlists was an awesome move, but having a chat-capability within the application would be so much more down-to-earth. Everytime I'm sharing a song via SMS, I have to backspace that auto-fill message of "HeRe'S a SoNG foR U.... UsEleSS inForMatiOn by YoU'lL seE iN the MeSSaGe PreView." So honestly I'd either suggest to just send a basic link without an auto-fill message, or to (please) create a chat capability in-app.
I see a lot of potential for furthering the connectivity of the website--**bleep**, no ads, no politics, just music and podcasts. It's as if you guys are the modern-day MySpace, but like... way better. Hope that's a compliment, it was meant that way.