How Facebook will take over the world.

(From Guardian Unlimited)

Facebook will announce its 500 millionth user any day now, and that's around 22% of all internet users globally. That's a pretty impressive milestone, but founder Mark Zuckerberg has already said he expects Facebook to reach one billion users before long.

But given that take-up among those key demographics in the developed world isn't far from saturation, the next phase of growth will be in developing markets and will prove harder work for the firm. Domestic incumbents, technological differences and government censorship. So how is Facebook moving in on those markets?

• Venturebeat interviewed Facebook's head of …