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In a speech at his company’s annual conference for developers, called F8, Mark Zuckerberg, Facebook’s 24-year-old chief executive, also demonstrated the company’s new design. He predicted that there would soon be a wave of social Web sites built on top of the information users give to social networks.
“We are going to see the big social networks start to decentralize into a series of social applications across the Web,” Mr. Zuckerberg said. “I think we are at the beginning of a movement and the beginning of an industry.”