Last month, the BBC and The Times found paedophiles were posting indecent comments on videos of youngsters, evading discovery through flaws in YouTube's reporting system.
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.
YouTube CEO Susan Wojcicki says "some bad actors are exploiting" the Google-owned service to "mislead, manipulate, harass or even harm".
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The reports led several big brands including Mars and Adidas to pull advertising from the site. The company said its new efforts to protect children from unsafe and abusive content and block hate speech on the site were modeled after the company's ongoing work to fight violent extremist content. Some 250 advertisers earlier this year also said they would boycott YouTube because of extremist videos that promoted hate and violence.
The company will also focus on training its machine-learning algorithm to help human reviewers identify and terminate accounts and comments violating the site's rules.
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Wojcicki says that YouTube is taking lessons learned from the first wave of the Adpocalypse - which was ultimately triggered by violent and extremist content - and applying them to tackle other forms of problematic content (as well as video comments), including those that pose child safety concerns and feature hate speech.
In addition to getting 10,000 Google employees' help, YouTube also plans to conjure up stricter criteria to consult when deciding which channels are eligible for advertising.
Machine learning is key to this process, however, and YouTube has already harnessed it to great effect in flagging violent extremist content - as well as comparable comments - for human review. She did not say how many people now monitor YouTube for offensive videos. The website said it is drastically increasing the number of people in charge of overseeing content.
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"As challenges to our platform evolve and change, our enforcement methods must and will evolve to respond to them".