I doubt that it is possible to nationalize Facebook since it means that you no longer have a global user-base and creating inter-op between such complex systems

I doubt that it is possible to nationalize Facebook since it means that you no longer have a global user-base and creating inter-op between such complex systems is all but impossible especially when we have hundreds of countries. This means that any free actor with one system for the entire world will always provide a better experience, so as soon as you nationalize a service most users will migrate away from it making the whole thing moot.