The revolution in Tunisia and the toppling of Egypt's President Hosni Mubarak resemble any number of prior upheavals, except for one thing - the role played by social media. Facebook, in particular, which once seemed just a high-tech way for teenagers to waste time, is now emerging as an important political tool. Why has social media been so useful to the protesters in North Africa? How will it be applied next? Will it really change the world?
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