My understanding -- I've never used it -- is that Bluesky uses some sort of "curated feed" list. The idea, from what I gathered, is that some person (or people?) could create a list of stuff and then people subscribe to it. Seemed like an interesting approach, since it's a route to improve personalizing content relative to, say, Reddit. Originally, Reddit intended to run off a recommendation system, but that kind of fell by the wayside in the first few years.

I've wondered how practical it would be to have people publish feeds, then take into account one's voting behavior and how it reflects feed content to help do recommendations. Can't just score a feed by aligned posts -- otherwise, it'd be trivially-gameable you could have people spamming by creating feeds and including popular things, and then also including some spam item. But I could imagine that being the foundation for something that does a good job of recommending stuff.