The falsehoods, most of which originated with the fringe movement QAnon, dramatically outnumbered results from credible news sources. Only one of the top results came from a mainstream news site, CNN, and it was an 11-month-old interview about her career. The algorithm rewarded the conspiracy videos over reliable news based on what it calculated was their “relevance,” signaling that the videos were probably new, popular or suitable to the search. By Thursday, a day after YouTube was contacted by The Washington Post, searches for “RBG” also surfaced multiple videos from mainstream news organizations.

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YouTube, a primary conduit for information, knows it has a problem. The Google-owned video site has changed its algorithms over the past year to surface more-reliable videos around major news events, learning from Google Search and Google News. It relies on an armada of human content moderators to vet what its algorithm flags as potentially problematic. But it is still dramatically outmatched by the pace and volume of videos that are uploaded, particularly around news events.

“While we’ve made good progress, we also recognize there’s more to do,” YouTube spokesman Farshad Shadloo said.

The hoaxes and conspiracy theories on YouTube can become gateways to more false information. YouTube’s recommendation engine automatically queues up additional videos based in part on what it thinks the user might want to watch next. Users who clicked on one of the QAnon-related conspiracies about Ginsburg were presented other videos claiming existence of a “deep state” that’s infested with demons and others saying a secretive Jewish cabal controls the world.

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YouTube has fiercely resisted the idea that it should serve as an arbiter of truth, arguing that a combination of tech tools and savvy consumers are best equipped to help separate fact from fiction.

Shadloo said the site has added text boxes on certain searches so users can more easily fact-check information for themselves. YouTube searches for “Ruth Bader Ginsburg” resulted in more-authoritative videos from news outlets including NBC and CBS this week — though many people refer to the justice by her initials.

The conspiracy around Ginsburg’s health wasn’t confined to YouTube. It became a subject of discussion in multiple Facebook groups, data from the social-monitoring firm CrowdTangle show. Others took to Twitter, where a search revealed multiple tweets — many with hundreds of shares and favorites and sporting QAnon-related hashtags — that questioned whether Ginsburg is actually dead.

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The prominence of conspiracy theories about one of the country’s most recognizable political figures highlights how misinformation slips through the cracks on social media sites, despite heightened efforts and high-profile promises by tech giants to police their platforms.

Facebook, which declined to comment, does not ban falsehoods but generally pushes problematic news stories shared on the site to fact-checkers and ranks content deemed to be a hoax lower in news feeds. Twitter said Wednesday it doesn’t serve as an arbiter of truth but relies in part on users who “are correcting and challenging the theories in real time.”

The roots of the latest Ginsburg conspiracy are with QAnon, which centers on cryptic messages posted on anonymous online forums. Some QAnon posts cast doubt on the Supreme Court justice’s health and the treatment doctors provided her. Followers of “Q” then posted videos on YouTube that explicitly cited the hoax or read its text to viewers in full.

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YouTube's algorithms don't verify statements for accuracy, and the company says such an undertaking would be virtually impossible: While its current technology can flag some violations, it is still far from comprehending the nuances of conversation, context and human speech. YouTube also said it faces an overwhelming logistical challenge in attempting to police the 450 hours of video uploaded to the site every minute.

But YouTube is the world’s second-most-visited website — ranked only behind Google, its parent company — and many viewers look to the video giant as a prominent source for credible news and information. And much like Google, its search algorithm is closely guarded, a secrecy that can make it impossible for viewers to understand why a video was given what seems to be a seal of approval atop YouTube search results.

“Data shows that Americans increasingly rely on YouTube as a source of news and information,” Virginia Sen. Mark R. Warner, the top Democrat on the Senate Intelligence Committee, said in a statement in response to the RBG videos. “It’s inexcusable that YouTube continues to shirk its responsibility to the public by allowing misinformation and hoaxes to flourish so widely on the platform.”

YouTube pledged to improve its search functions in 2017 after a flood of misleading videos overwhelmed the site following the Las Vegas mass shooting that left 58 people dead, and again last year after the site’s algorithms highlighted videos attacking the teenage survivors of the school shooting in Parkland, Fla. In October, YouTube chief executive Susan Wojcicki said that surfacing relevant results was one of the company’s biggest challenges, adding, “We really want those top results to be right.”

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But the “RBG” results show how the algorithm still struggles from the same core vulnerabilities, spotlighting viral hoaxes and misleading videos while also burying more credible content. Many of the “RBG” conspiracy-theory videos came from niche video creators with only a few thousand views. But because YouTube’s search algorithms rated the videos as having the highest “relevance” to searches about “RBG,” based largely on factors such as view count and upload date, the site rocketed them to the top of the rankings, helping to introduce the videos to a vast and unsuspecting new audience.

YouTube said that the conspiracy-theory videos did not appear to violate its policies on harmful or dangerous content and that it has made progress in tackling videos ripe for deception or manipulation. A viewer searching for “moon landing fake,” for instance, is now shown a brief encyclopedia entry and videos debunking the idea.

But the site still often fails to provide that level of context for ongoing or very recent news events — the kind of developing stories many viewers may end up searching about. More than half of all adults surveyed by the Pew Research Center last summer said they thought YouTube was important to “understanding things happening in the world.”

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Joan Donovan, the director of the Technology and Social Change Research Project at Harvard University, said that QAnon and other conspiracy theories have developed a “foothold on YouTube” and that their followers have been successful in using the site to reach broad new audiences.