It is, frankly, _weaponized_ facebook. It literally shows you content that is the most-engaging and most-interacted, across the entire site (not just your friend group). Which is ironic, given how often users there was philosophical about the evils of facebook.

If you don't believe me, go browse /r/popular or some such and see how long it takes to see right-wing posts. The right-wing posts are usually heavily downvoted, so you'll see one with 100 upvotes between two posts with 20k upvotes; that's by design.