With another Facebook scandal erupting, thanks to a New York Times investigation, Brian Stelter talks with researcher Renee DiResta about misinformation and the tech companies. DiResta, the head of policy at Data for Democracy and director of research at New Knowledge, explains Facebook's missteps and describes how she studies the spread of "malign narratives." She says people should think of misinformation "as more of a chronic condition," not a fixable problem.

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