

Last.fm is probably the closest thing functionality-wise to what you’re looking for as far as reccomendations go.
You can “scrobble” or log what you’ve listened to or enjoyed from a metric ton of sources, and reccomendations are based off the user community and tagging. Covers popular to underground and everything in between.
Not sure what the whole “federated” part of this adds to anything.










There have also been a rash recently of newly created accounts making 3-10 posts to comics comms and then bouncing (deleting the account or just not doing anything else).