YouTube employs more people to identify extremist video content

Google-owned You Tube has vowed to increase its surveillance of inappropriate content.  AFP

Wojcicki said machine learning is helping Youtube's human reviewers remove almost five times as many videos than previously and that today, 98 per cent of the videos removed for violent extremism were flagged by machine-learning algorithms.

Google will have more than 10,000 workers address the problem by next year, though her blog post Monday doesn't say how many the company already has.

"Our advances in machine learning let us now take down almost 70 percent of violent extremist content within eight hours of upload and almost half of it in two hours and we continue to accelerate that speed", Wojcicki noted.

Talking about the machine-learning program, Wojcicki noted that human reviewers are an essential part of removing content and training the machine-learning system because human judgment is significant in making "contextualized" decisions on content.

"Our teams also work closely with NCMEC (National Center for Missing and Exploited Children), the IWF (Internet Watch Foundation), and other child safety organisations around the world to report predatory behavior and accounts to the correct law enforcement agencies".

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The statement also said YouTube was also reforming its advertising policies, saying it would apply stricter criteria, conduct more manual curation and expand its team of ad reviewers. Equally, we want to give creators confidence that their revenue won't be hurt by the actions of bad actors.

Wojcicki also revealed that 98 per cent of the videos the platform removes for violent extremism are now flagged by its machine-learning algorithm.

"We need an approach that does a better job determining which channels and videos should be eligible for advertising", she said.

The technology has reviewed and flagged content that would have taken 180,000 people working 40 hours a week to assess, according to Wojcicki. "We've heard loud and clear from creators that we have to be more accurate when it comes to reviewing content, so we don't demonetize videos by mistake".

YouTube has weathered a constant stream of negative press in 2017 for the role it has unwittingly played in the spread of misinformation, hate speech, and other content which could be harmful to children.

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