Facebook is intrinsically a passion-group generator. Where "passion" is the edges of "adoration" to "enmity". Anything that "triggers" you (to interact w/ the platform), be it pottery or anarchy, FB will find "your people". If you are prone to fits of passion, FB will find your passion-mates... mated to you by fear, anxiety, rage ... or joy.
I really don't know about this. There are certainly fringe groups active on Facebook but at least in my immediate circle it's mostly a tool to connect families, friends and communities. I really don't see it as a forum for ideas or activism, unlike Twitter or reddit. but maybe that's just the bubble I'm in.
Exactly -- and that's the real danger of algorithmic engagement-driven content.
For you, it's picking harmless content because that's what you engage with. But once you start engaging with, say, some crazy cult, Facebook's algo will pick up on that, and start prioritizing content from the crazy cultists. In time, you'll get to the point where you're only seeing content from the cultists, and come to believe that's what everyone thinks, because that's all you'll ever see. YouTube suffers from this too.