Fairly sure there was a story recently where Facebook accidentally turned off "the algorithm" for some people for months and it made them miserable and angrier. I can't find it because Google thinks any related search is actually trying to look for "how to get unbanned from Facebook" though.

One reason for this is algorithmic sorting is what gets rid of spam and hides annoying acquaintances you had to friend who never shut up. If you want engagement you don't actually want to show everyone endless political arguments; sex and animal pictures are what's really engaging.