"Some of the world’s biggest marketers halted YouTube spending this month after ads from large brands were found running alongside hateful and extremist videos. Google parent Alphabet Inc. risks losing $750 million in revenue this year from the debacle, analysts at Nomura Instinet estimated this week. A potential solution lies in machine learning, a powerful AI technique for automatically recognizing patterns across reams of data — a Google specialty. Computer scientists doubt technology alone can expunge offensive videos. 'We’re not there yet where we can, say, find all extremist content,' said Hany Farid, a Dartmouth professor and senior adviser to the Counter Extremism Project, which has repeatedly called on YouTube to tackle this problem. He recommends companies like Google and Facebook Inc. deploy more human editors to filter content. 'Machine learning, AI is nowhere near that yet,' he said. 'Don’t believe the hype.'"