And back when you could log into Facebook and see a feed of all of your friends’ posts quickly. Facebook eventually got to the point where for most people the feed would have been much longer than the time they wanted to spend on site, and so showing them just the most recent few is somewhat random. Much better for engagement to show them posts they like.
???
I said I don't find A/B tests unethical. Literally every tech company runs A/B tests just like that one. Why would I ask for 20k more?
> Previously the feed was chronological post of friends
Yeah, before they measured the impact of a good recommendation algorithm.