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Facebook’s A.I. Whiz Now Faces the Task of Cleaning It Up. Sometimes That Brings Him to Tears.

MENLO PARK, Calif. — Mike Schroepfer, Facebook’s chief technology officer, was tearing up. For half an hour, we had been sitting in a conference room at Facebook’s headquarters, surrounded by whiteboards covered in blue and red marker, discussing the technical difficulties of removing toxic content from the social network. Then we brought up an episode […]