I noticed last year that FB did some change to their recommendations engine, that they’ll show posts by random people based things you’ve searched. A friend was diagnosed with cancer last year, I searched extensively, and now I’m exclusively getting posts from random people with cancer on my feed.
It’s often very good at finding posts that I might theoretically want to read, except that I never want to read them on Facebook, because it would get in the way of seeing posts from friends.