Examining the warning signs of online extremism targeting young people

After the racist rampage that killed 10 Black people in Buffalo last month, the shooter admitted he had been radicalized online. As young people spend more time in virtual networks, parents and guardians are looking for ways to keep them safe. Cynthia Miller-Idriss, director of research at American University's Polarization and Extremism Research Innovation Lab, joins Ali Rogin to discuss.

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