The Journal.

In the fourth episode of our investigative series based on an extensive array of internal Facebook documents, we explore the fallout of a major algorithm change the company made in 2018. The documents outline how an emphasis on engagement incentivized the spread of divisive, sensational content and misinformation. WSJ’s Keach Hagey and Jeff Horwitz explain how attempts from within the company to undo some of the damage were often thwarted.