High-Tech Crackdown

Not all flash mobs are about fun. Chicago and Philadelphia set nighttime curfews this summer to keep teenagers off the streets, after youths began using cell phones to organize mayhem-themed meet-ups. On Aug. 11 in San Francisco, the Bay Area Rapid Transit authority blocked cell service in some train stations to thwart organizers of a rumored protest against police violence. But there was retribution: Anonymous hackers broke into the transit agency's website and forced it off-line.


'I have no problem with folks saying, "Obama cares." I do care.'

PRESIDENT OBAMA, in response to a question in...

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