A tech exec is funding a network of hundreds of security cameras in San Francisco, turning community groups into crime watchdogs with support from the city's DA

· A San Francisco tech executive has launched and funded a network of security cameras across the city in response to a property crime plight that has plagued the city for years, per a report in The New York Times.
· Startup founder Chris Larsen has poured $4 million into the cameras, which are monitored by neighborhood groups...