I use an app called Giraf, which I built [0]. My friends and I use it to share the music (and culture in other mediums, e.g. books and movies) that we've been into lately. When something looks interesting, I can save it and it'll be added to a playlist in my Spotify account. I've found that this async format unlocks a lot of discovery that wouldn't have happened otherwise, because the recommendations wouldn't have risen to the level of sending them directly to each other in a text message.

I've worked on this for a few years now, and haven't really shared it on HN before. Any feedback is very welcome!

[0] https://giraf.app