In the highly contentious realm of advertising, Wojcicki says the company will apply stricter criteria, conduct more manual curation, and ramp up its ad reviewer team to ensure that campaigns aren't appearing next to offending videos. Subsequent revelations that YouTube was offering up cartoons featuring what the BBC called "animated violence and graphic toilet humor" added fuel to the controversy.
She said: "I've seen how some bad actors are exploiting our openness to mislead, manipulate, harass or even harm".
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The video-sharing platform has been criticised in recent weeks for failing to prevent predatory accounts and commenters from targeting children, as well as for the ease at which terrorist propaganda is uploaded to the site.
YouTube said machine learning was helping its human moderators remove almost five times as many videos that they were previously, and that 98% of videos removed for violent extremism are now flagged by algorithms.
Apart from expanding the current strength, the company plans to take punitive measures about inappropriate comments by introducing new comment management tools and blocking mechanisms.
"Now, we are applying the lessons we've learned from our work fighting violent extremism content over the previous year in order to tackle other problematic content", Wojcicki wrote. We want advertisers to have peace of mind that their ads are running alongside content that reflects their brand's values.
In June YouTube announced that it would take steps to address the problem by improving its use of machine learning to remove controversial videos and by working with 15 new expert groups, including the No Hate Speech Movement, the Anti-Defamation League and the Institute for Strategic Dialogue.
Back in March, a number of companies pulled their ads from the site after learning they had been linked to videos with extremist content and hate speech.
"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 demonetise videos by mistake".
"We believe this requires a new approach to advertising on YouTube, carefully considering which channels and videos are eligible for advertising".