Twitter Partner's Alerts Highlight Divide Over Surveillance

A Twitter data partner, Dataminr, sells a service to law enforcement and other agencies that monitors Twitter's full feed and sends alerts that include tweets about protests. That has the companies at odds with privacy advocates over what level of social-media monitoring qualifies as surveillance. Reporter Parmy Olson explains. Amanda Lewellyn hosts. Learn more about your ad choices. Visit megaphone.fm/adchoices