Not my cup of tea but just brainstorming of having a mixture of Last.FM with listening to 'someone's' recent playlist would be cool.

E.g. 'I am 60% similar to you in taste, I can now listen to the last 24 hours of what you've "publicly aired"'

Does Last.fm premium do that? I'm yet to find a music platform that you can rate music, listen, share and socialise effectively. Last.fm is too focused on scrobbling.