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Even as its share price continues to slide, the biggest social network in the world continues to innovate. Annoying but indispensable, sometimes controversial, Facebook has created dozens of new markets, given work to hundreds of new companies. It has taken over the hearts and minds of our young, with one out of nine British teenagers spending eight hours a day in front of its blue-framed interface. But how well do you really know the service that has profoundly changed the way we use the Internet?
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What is the name of Facebook's charismatic leader?