YouTube will disable comments on videos with children, after a vlogger claimed he had found instances of pedophiles targeted to videos of young girls on the site.
The video sharing platform said it had suspended comments on tens of millions of videos over the past week that "might be in danger of attracting predators".
US based blogger Matt Watson, who runs the MattsWhatItIs channel, claimed he had discovered a "wormhole" in a "soft-core pedophile ring".
In a video posted on the platform, he said that pedophiles had links to child pornography, shared contact information, and traded unlisted videos in the comment sections under videos.
Many of the videos that are targeted are "innocent" and legal, and show that children perform everyday activities at home.
Watson also claimed the site's recommended feature, which directs users to similar videos, "facilitating" pre-computer connectivity capabilities.
Companies, including Nestle and Fortnite maker Epic Games, have drawn their advertisements on the site for the allegations.
In a statement on the Creator Blog, YouTube said it took "important steps" that are "critical to keeping young people safe" and would continue to identify videos at risk.
The statement said: "Over the next few months, we will extend this action to suspend comments on videos of young minors and videos of older minors who might be in danger of attracting predators."
YouTube added that a "small number of creators" could keep the comments, but must actively monitor and show that they had "low risk of predators".  The platform also introduces a new "comments classifier" that will be able to detect and remove twice as many annoying comments as today's system.
This is not the first time YouTube has been scrutinized over content f
In 2017, Mars and Adidas drew advertisements from the site after campaigns announced that pedophiles were targeting videos of children.
A survey in The Times found predators left obscene comments and attempted to encourage the children who sent the videos to participate in private discussions through online forums.
After turning on, YouTube said it had "hard" its approach to videos and comments with children and was "committed to getting it right".
Last week, YouTube said it had shut down more than 400 channels in 48 hours in an aggressive approach beyond the ordinary protection.