Thanks to @emacsomancer for forwarding to me this article about "demetrification" of social media https://www.wired.com/story/internet-healthier-without-like-counts/ (not showing like counts, follower counts, etc) and how dramatically user behavior is changed when we do expose these things.
On BoingBoing: https://boingboing.net/2019/09/12/flickrs-glory-days.html