In this photo taken July 14, 2011 actors dressed in beach attire participate in a flash mob as part of a commercial for McDonald's in Chicago. 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/Charles Rex Arbogast) The Associated Press In this photo taken July 14, 2011, actors dressed in beach attire participate in a flash mob as part of a commercial for McDonald's in Chicago. 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/Charles Rex Arbogast) The Associated PressThanks to social networks 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.In the Cleveland suburb of Shaker Heights, as many as 1,000 teenagers mobilized through social networking sites turned out during the Fourth of July fireworks and soon started fighting and disrupting the event.Flash mobs started off in 2003 as peaceful and often humorous acts of public performance, such as mass dance routines or street pillow fights. But in recent years, the term has taken a darker twist.The Cleveland City Council passed a bill to make it illegal to use social media to organize a violent and disorderly flash mob, though the mayor vetoed the measure.

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