https://www.nytimes.com/video/technology/100000008009850/john-thune-frances-haugen-whistle-blower-facebook-engagement-based-ranking.html

Senator John Thune, Republican of South Dakota, asked the Facebook whistle-blower to detail the danger of engagement-based ranking, which is used by Facebook and other social media platforms to determine which content they believe is most relevant to users’ interests.