Ah, yes! The 3 billion Americans on Facebook!
And why would you make that assumption? The internet has no borders, so it doesn’t really matter where or by whom something is made. Especially if the language is English, which has somewhere between 1.5 and 2 billion speakers worldwide.
Yes, I saw that. But it is obviously meant to be an analogy for how Facebook is a website famously made in America by an American.