Ugh, I can't even. I still check it occasionally, but the ads are incessant, and I feel like I'm being manipulated. I'll sometimes see a post by a distant friend, made several days ago, with no engagement from anyone (let alone mutuals); but it comes up in my feed.
Yet other times, something from a close friend with heaps of likes and comments from mutuals, never appears on my feed. If the service is free, the product is me.
Yes, what Facebook shows you is irrational and annoying to the user. I have not posted anything to my personal page in years, but simply use it for the local groups. My feed is mostly ads and posts from "suggested" pages, which center around themes that I like (history, for example) but are these sad little snippets of stories, and often poorly researched. The feed is just a time sucker, and I have the sense that it has stolen away minutes of my life every time I look at it. So cheers to mutual Facebook frustration. If only we could get enough people to feel the same, so that we could move the groups elsewhere.