Spotify has nailed the social aspect of music sharing/collaborative playlist creation through its great Facebook integration (at least here in Norway where "everyone" uses Spotify).

From what I've seen of Apple Music it seems like they haven't bothered with the social aspect at all. Is it even possible to share what you're listening to and collaborate on playlists?

That may not be a big deal for some people, but I'm pretty confident that at least my group of friends won't switch to a streaming service where collabrating on playlists isn't super easy (or even possible).