A good solution to this would be to put a hiring freeze on any ex-Facebooker and claim that if they can overlook Facebook's questionable practices, then they would be a danger for your company and its customers.
Hold employees responsible for the actions of their employer.
You could institute a "two year freeze" for any FB alum. A public statement by an ex-employee rebuking these practices would be enough to sidestep the hiring moratorium, but make them acknowledge how bad their employer is for privacy and democracy.
Especially after what they did with the last US election cycle.