Digmen1 - 8:35 pm on Oct 11, 2012 (gmt 0)
The world is a lot more sophisticated than you think.
Of course there is a high percentage in Europe and the USA with computers and phones etc.
And millions more in China and India and Africa are getting mobile phones. And one of the first things they will do is join Facebook.
That's why Asian and Russian sites feature very high in Alexa traffic ratings.
But of course a lot of the users will be under 13's and duplicates and fakes etc etc.