Me absent mindedly: This post is mildly interesting. *Hits Like
Facebook algorithm: Did you like a post by this page? You must adore this page above all other things ever! Your wishes are my command, we will show you 700 posts by this page everyday.
Me seeing a sexist post by an old acquaintance I hardly remember: *comments. You sir are a closed minded person and the reason the world is a terrible place.
Facebook algorithm: Did you comment on this guy's post? He must be your very most favourite human being ever. Let's stop showing posts by all those other people and focus just on this one. Here, he just made a homophobic comment you sure gonna like.