"Since June, our trust and safety teams have manually reviewed almost two million videos for violent extremist content, helping train our machine-learning technology to identify similar videos in the future".
YouTube will also expand its number of reviewers that check to make sure ads run next to appropriate videos.
However, Wojcicki stressed that human reviewers remain essential to both removing content and training machine learning systems because "human judgment is critical to making contextualized decisions on content".
In the past year, YouTube has tightened its policies on what content can appear on the platform, increased its enforcement teams and invested in new machine learning technology to scale the efforts of its human moderators.
"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".
She said that since June, when Youtube deployed new technology to flag violent extremist content for human review, the platform had manually reviewed almost 2m videos and removed 150,000.
Destiny 2: Curse of Osiris Out Today, Here's the Launch Trailer
Lastly, you will be able to play Destiny 2 Curse of Osiris immediately after the servers are back online. It will also feature battles with the time-travelling Vex in brand new campaign missions.
Over the last two weeks, YouTube has removed hundreds of thousands of videos involving children in potentially exploitive situations, including duct-taped into a wall, forced into a washing machine, and other more serious scenarios.
YouTube says its machine-learning algorithms help take down 70 percent of violent extremist content within eight hours of upload.
Going forward, she said that YouTube would be "carefully considering which channels and videos are eligible for advertising".
We are also taking aggressive action on comments, launching new comment moderation tools and in some cases shutting down comments altogether.
The technology has reviewed and flagged content that would have taken 180,000 people working 40 hours a week to assess, according to Wojcicki.
It said adverts for major brands were appearing alongside some of the videos, which led to several big brands including Mars and Adidas pulling advertising from the site. The website said it is drastically increasing the number of people in charge of overseeing content.