the invention of the for you feed caused people to live in bubbles. used to be that if someone was like (random example) "i hate italians they should all choke on their spaghetti" everyone would be like "wtf dude get out of here loser" and they'd be booted. you were exposed to a variety of people on forums like this one.
nowadays if you post "i hate italians they should all choke on their spaghetti" you'll be greeted with a flood of people who also hate italians and want them to choke on their spaghetti, and your feed will fill with anti-italian content. and that makes you go "aha see, most people also hate italians! that's why there's so many of these posts!" it reinforces your internal biases because you're only exposed to the familiar over and over.
i think that's what causes so much anger on normal social media... there's also a related problem. let's say there was a mass shooting in your town or something and you wanted to find out the day of the memorial service. you only looked this up because you wanted one piece of information. suddenly the algorithm goes "oh! this person wants ALL the information on violent crime!" and floods you with upsetting content for weeks even if you try countering it with other searches.
immensely frustrating especially as a small creative that has to utilize the algorithm to build a fanbase. sighhhhh. (-.-)