LEaDERS OF the "real" and "virtual" worlds will meet, en masse, for the first time in northern France today. at the G8 world economic summit in Deauville in Normandy, the future of the internet will join the arab Spring, africa and nuclear safety as an official "problem" on the agenda of the most powerful men, and women, on earth.  But which of the two groups present can be said, truly, to be the most powerful men, and women, on earth? Barack Obama (US), Nicolas Sarkozy (France), angela Merkel (Germany), David Cameron and friends will receive a delegation from cyberspace led by, among others, Mark Zuckerberg (Facebook) , Eric Schmidt (Google), Hiroshi Mikitani (Rakuten, the Japanese on-line shopping giant) and Yuri Milner (a Russian billionaire investor).  The usually reclusive Mr Zuckerberg and others have been selected to convey to the first day