Yeah, remember those internal Facebook documents that the UK was able to get hold of through somebody who had sued Facebook?
They're here. Courtesy of the UK parliament.
(You might want to be careful about that link. The document is about 250 pages long.)
Details on discussions about how Facebook tried to keep giving excessive amounts of data to developers and corporate customers, details on how Facebook tried to keep details about app activities from individual customers, details on how they promoted a VPN app that harvested user data for Facebook, details about how Facebook targetted competitors, that sort of thing. More details here. Another take here.
FaceBook has been sending signals for years on how trustworthy the company is.
See my longer comments at
https://cragins.blogspot.com/2018/10/trusting-facebook.html