So-called “flash mobs” that form with the help of social technologies have become part bullying, part running of the bulls in Philadelphia as teenagers sprint through the streets, sometimes brawling and vandalizing, reports the New York Times. The flash-mob trend started innocently enough seven years ago as an act of performance art, where people linked through social-networking web sites and text messaging suddenly gathered on the streets for impromptu pillow fights in New York, group disco routines in London, and even a huge snowball fight in Washington. But these flash mobs have taken a more aggressive turn...

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