For me the ideal social media feed would look a lot like Hacker News. Literally every day I find something interesting here. Something technical I didn't know, something new I never heard of, something that makes me think. Rather than social media sites that keep trying to spiral me into their bubbles of things I looked at before. When in fact I come here to see stuff that I didn't know. I don't want more of the same but yet that seems to be considered the holy grail of engagement algorithms.

It's amazing how free sharing works when it's not constantly fiddled with by algorithms. There is user voting of course but I read the 'new' page a lot too.