Oh, yeah. You could add all the people that earn 1 dollar a day and spend tens of dollars/year on each of them using money from more pension funds investors.
That would be great...
Some advice, you could go out of Western countries and see how people live there.
No, they don't have a billion users. And no, there's isn't growth left. Theoretically there is the potential that they could grow still, but it isn't happening.
one billion active? are you sure? I have two accounts and one of them was a joke account from the get go, the other I haven't used in months. But that's 2 "active" profiles in the stats right there, I constantly get email for them.