I don't often reply to these, but as a privacy and security advocate, I need to level with you.
Facebook as a company has built some awesome things, I have a lot of respect for the React Team and the FP push at FB.
That being said, Facebook is a privacy and security destroying cancer.
Using Facebook trains unsafe behavior, because sharing information exposes users to attacks which would otherwise be more difficult to pull off. In addition, thanks to the 3rd Party doctrine, anything shared on Facebook can be used against you at some point in the future, and you have no reasonable expectation of privacy.
People who take online security seriously do not have Facebook accounts, or if they do, the accounts are entirely fake. I'm sure the security devs make plenty of money more than they would working for the FBI, DEA or NSA... and its reasonable considering they work for all 3 at once, and many others (foreign governments, and police among them).