Surely anything that is not simply ignoring a post is an engagement as far as the algorithm is concerned. Which would include likes and angry etc. Perhaps they

Surely anything that is not simply ignoring a post is an engagement as far as the algorithm is concerned. Which would include likes and angry etc. Perhaps they get weighted less than a reshare or comment, but I'm sure they're in there. You reacted, however trivially, so you'll now get more of it. You'll get more of it even if you reshare with a comment along the lines of "this is complete rubbish". So the more outrageous rises to the top.