The privacy policy (lol) in all corp software is riddled with exceptions to steal data. That is the trick
You >>Privacy Policy>>FB>>C|@.
And since you agreed, corporations cannot be held liable for an allegedly mutual exchange of goods and services. They told you.
C|@ comes to FB with a sealed subpoena, now FB HAS to give the stolen data to C|@. Eventually they just streamline shit and steal everything, but that is the basic premise.