How is my reason sarcastic? I'm being completely serious. And yes, of course it needs to work world-wide but I think it's naive to think that's the primary reas

How is my reason sarcastic? I'm being completely serious. And yes, of course it needs to work world-wide but I think it's naive to think that's the primary reason FB would be doing it. They'd be doing it because they want complete control of the authentication ecosystem.