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A message appears on a profile of a popular social network in a country suffering from political unrest. Seconds later it is repeated on another profile, and then another, and another. Within minutes the message spreads to hundreds, even thousands of profiles, from a core group of closely related users, to loosely affiliated contacts. Before the day is out, people are in the streets chanting for the end of the regime and those in power are seriously considering their next steps.

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