Seems this is the leaks they were worried about:
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'Carol's Journey': What Facebook knew about how it radicalized users
Internal documents suggest Facebook has long known that its algorithms and recommendation systems push some users to extremes.
In the summer of 2019, a new Facebook user named Carol Smith signed up for the platform, describing herself as a politically conservative mother from Wilmington, North Carolina. Smith's account indicated an interest in politics, parenting, and Christianity, and followed a few of her favorite brands, including Fox News and then-President Donald Trump.
Though Smith had never expressed interest in conspiracy theories, in just two days Facebook was recommending she join groups dedicated to QAnon, a sprawling and baseless conspiracy theory and movement that claimed Trump was secretly saving the world from a cabal of pedophiles and Satanists.
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