In this March 20, 2010, photo, young people fill South Street during a flash mob incident that involved thousands and closed the street to traffic from Front Street to Broad in Philadelphia. Thanks to websites like Twitter and Facebook, more and more so-called flash mobs are materializing across the globe, leaving police scrambling to keep tabs on the spontaneous assemblies. (AP Photo/The Philadelphia Inquirer, Laurence Kesterson)

In this March 20, 2010, photo, young people fill South Street during a flash mob incident that involved thousands and closed the street to traffic from Front Street to Broad in Philadelphia. Thanks to websites like Twitter and Facebook, more and more so-called flash mobs are materializing across the globe, leaving police scrambling to keep tabs on the spontaneous assemblies. (AP Photo/The Philadelphia Inquirer, Laurence Kesterson)

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