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Hundreds of people are protesting down the street. The police arrive and find -- no one? The protesters are gone, but how did they know what to do?

By being linked together via technology, members of smart mobs can receive word the police are on their way to a protest site, and leave quickly -- only to regroup in another area. As long as the police aren't privy to the communications the mob receives, the group should be able to remain one step ahead.

Full article at HowStuffWorks.com.

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