The change to the company’s recommendation algorithms is the result of a six-month-long technical effort. It will be small at first — YouTube said it would apply to less than 1 percent of the content of the site — and affects only English-language videos, meaning that much unwanted content will still slip through the cracks.

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The company stressed that none of the videos would be deleted from YouTube. They would still be findable for people who search for them or subscribe to conspiracy-focused channels.

“We think this change strikes a balance between maintaining a platform for free speech and living up to our responsibility to users,” the blog post said.

YouTube, which has historically given wide latitude to free speech concerns, does not prohibit conspiracy theories or other forms of false information. The company does ban hate speech but defines it somewhat narrowly as speech that promotes violence or hatred of vulnerable groups.

Advocates say those policies don’t go far enough to prevent people from being exposed to misleading information, and that the company’s own software often pushes people to the political fringes by feeding them extremist content that they did not seek out.

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YouTube’s recommendation feature suggests new videos to users based on the videos they previously watched. The algorithm takes into account “watch time” — or the amount of time people spend watching a video — and the number of views as factors in the decision to suggest a piece of content. If a video is viewed many times to the end, the company’s software may recognize it was a high-quality video and automatically start promoting it to others. Since 2016, the company has also incorporated satisfaction, likes, dislikes, and other metrics into its recommendation systems.

But from a mainstream video, the algorithm often takes a sharp turn to suggest extremist ideas. The Washington Post reported in December that YouTube continues to recommend hateful and conspiratorial videos that fuel racist and anti-Semitic content.

More recently, YouTube has developed software to stop conspiracy theories from going viral during breaking news events. In the aftermath of the Parkland, Fla., school shooting in February, a conspiracy theory claiming that a teenage survivor of the school shooting was a “crisis actor” was the top trending item on YouTube. In the days following the October 2017 massacre in Las Vegas, videos claiming the shooting was a hoax garnered millions of views.

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YouTube’s separate search feature has also been called out for promoting conspiracies and false content. Earlier this month, for instance, a search for RBG, the initials of Supreme Court Justice Ruth Bader Ginsburg, returned a high number of far-right videos peddling conspiracies — and little authentic content related to the news that she was absent from the court while recovering from surgery.