Welcome to Web 2.0, Mark Zuckerberg style.
Dozens of the world’s biggest media moguls and investment bankers, dressed in perfectly pressed suits, mingled in the lobby of the Pierre Hotel in Manhattan yesterday at the annual FourSquare conference.
And then there was Mark Zuckerberg, the 22-year-old chief executive of the social networking site Facebook, wearing Adidas flip-flops — sans socks — with a blazer and jeans.
The FourSquare conference has become the East Coast incarnation of Allen & Company’s annual summer gathering in Sun Valley, Idaho, which has been the hatching place for all kinds of major and minor deals.
And if Chad Hurley, the chief executive of YouTube, was the belle of the ball at Sun Valley this summer, then Mr. Zuckerberg was the “it” boy of FourSquare.
Mr. Hurley was also in attendance yesterday, still basking in the glow of his company’s sale to Google for $1.65 billion — and also wearing a blazer and jeans, though he had shoes on.



















