It sounds like something from a futuristic TV thriller: American spies thwarting a terrorist plot through a shared online community modeled after Wikipedia the free user-created web-based encyclopedia. But Anthony D. Williams co-author of the new book Wikinomics: How Mass Collaboration Changes Everything recently told a conference at Wharton’s Mack Center for Technological Innovation that this online community of spies already exists -- along with a host of other activist-oriented web sites that are changing the rules of the global economy.

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