So I read that spotify tested out a chat system and it failed due to a lack of user engagement. The reason I wanted this system and I'm sure everyone else wanted this system was purely to share songs with their friends without having to leave spotify. So my idea is to have a button next to the share button (make it noticable to people and seperate it from sharing it outside the app) and when you click on it it will have a list of all your friends. When you select a friend to share it with it will have the song, album, artist, or playlist and the option to write a message. Once sent the user can recieve it as a notification and maybe they can have the option to reply with a message, song, emoji, or even a rating so the sender can see how they like the song.
Updated on 2019-07-14
Hello and thanks for bringing your feedback to the Idea Exchange.
A similar idea has also been suggested here.
More information about how the Spotify Idea Exchange works can be found: here.