Moving up in the world: Facebook boss Mark Zuckerberg upscales from four-bed rented home... into an equally plain five-bed round the corner

He is worth an estimated $7billion - but Mark Zuckerberg is anything but flash.The Facebook founder's new pad won't be found on some millionaires' row, instead it's an extremely modest abode bordering on the dowright ordinary.Zuckerberg has moved just half a mile from his old place in the Paolo Alto suburb of San Francisco and upscaled to five bedrooms from four.And, perhaps sensibly in