Key difference: Facebook has 750 million active users. Google+ has 10 million users.
I don't have time for the Socratic method.
NUMBER OF USER ACCOUNTS IS NOT THE SAME THING AS NUMBER OF INDIVIDUAL PERSONS. THE NUMBER OF USER ACCOUNTS IS ALWAYS HIGHER THAN NUMBER OF INDIVIDUALS.
Did that help?
I always assumed they were telling the truth because they're legally bound to (and because if they're caught lying, it would suck badly for them). I'm just wondering if you have any more info than that, since you seem so emphatic about it.