Elon Musk [@elonmusk]. Trashing accounts that you hate will cause our algorithm to show you more of those accounts, as it is keying off of your interactions. Basically saying if you love trashing *that* account, then you will probably also love trashing *this* account. Not actually wrong lol. January 2023. URL: https://twitter.com/elonmusk/status/1615194151737520128 (visited on 2023-12-07).
What stands out about this source is that it is the owner of Twitter openly admitting the algorithm rewards hate engagement, and treating it like a funny quirk, instead of a problem. It backs up the chapter's point about pile-ons: the system doesn't separate liking something from being angry at it, it just sees interaction.