For now, the friends feed is only read only, but it has potential to become more social.
What about a simple Drag'n Drop feature to suggest a track to a subscribed friend?
It would trigger a notification (on desktop or mobile) just to tell "Your friend suggests you to listen to <title> <artist>!". Clicking it would play it instantly or add it to the queue.
Simplier than the classic social media sharing and faster for users.
Updated on 2019-03-28
Hey and thanks for your contribution!
A similar idea has also been suggested here
Add your vote and comments in support there please : )