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Social Media Apps Help Public Agencies, But Raise Questions

Social media are changing the ways that police departments and other public agencies do business.  New media are helping monitor police and keeping the traffic moving on congested highways. But they are also raising questions. At the Los Angeles public transit system known as LA Metro, workers monitor banks of video screens showing buses on their routes  and busy intersections, looking for delays or other signs of trouble.   The system uses information from its cameras...

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