In November 2009, a researcher at the Rey Juan Carlos University in Madrid found that the English Wikipedia had lost 49,000 editors during the first three months of 2009; in comparison, the project lost only 4,900 editors during the same period in 2008. The Wall Street Journal cited the array of rules applied to editing and disputes related to such content among the reasons for this trend. Wales disputed these claims in 2009, denying the decline and questioning the methodology of the study. Two years later, in 2011, Wales acknowledged the presence of a slight decline, noting a decrease from "a little more than 36,000 writers" in June 2010 to 35,800 in June 2011. In the same interview, Wales also claimed the number of editors was "stable and sustainable". A 2013 article titled "The Decline of Wikipedia" in MIT's Technology Review questioned this claim. The article revealed that since 2007, Wikipedia had lost a third of its volunteer editors, and those still there have focused increasingly on minutiae. In July 2012, The Atlantic reported that the number of administrators is also in decline. In the November 25, 2013, issue of New York magazine, Katherine Ward stated "Wikipedia, the sixth-most-used website, is facing an internal crisis".
In February 2019, YouTube vlogger Matt Watson identified a "wormhole" that would cause the YouTube recommendation algorithm to draw users into this type of video content, and make all of that user's recommended content feature only these types of videos. Most of these videos had comments from sexual predators commenting with timestamps of when the children were shown in compromising positions, or otherwise making indecent remarks. In some cases, other users had reuploaded the video in unlisted form but with incoming links from other videos, and then monetized these, propagating this network. In the wake of the controversy, the service reported that they had deleted over 400 channels and tens of millions of comments, and reported the offending users to law enforcement and the National Center for Missing and Exploited Children. A spokesperson explained that "any content — including comments — that endangers minors is abhorrent and we have clear policies prohibiting this on YouTube. There's more to be done, and we continue to work to improve and catch abuse more quickly." Despite these measures, AT&T, Disney, Dr. Oetker, Epic Games, and Nestlé all pulled their advertising from YouTube.
More InfoMost videos enable users to leave comments, and these have attracted attention for the negative aspects of both their form and content. In 2006, Time praised Web 2.0 for enabling "community and collaboration on a scale never seen before", and added that YouTube "harnesses the stupidity of crowds as well as its wisdom. Some of the comments on YouTube make you weep for the future of humanity just for the spelling alone, never mind the obscenity and the naked hatred". The Guardian in 2009 described users' comments on YouTube as:
More InfoYouTube has been criticized for using an algorithm that gives great prominence to videos that promote conspiracy theories, falsehoods and incendiary fringe discourse. According to an investigation by The Wall Street Journal, "YouTube’s recommendations often lead users to channels that feature conspiracy theories, partisan viewpoints and misleading videos, even when those users haven’t shown interest in such content. When users show a political bias in what they choose to view, YouTube typically recommends videos that echo those biases, often with more-extreme viewpoints." When users search for political or scientific terms, YouTube's search algorithms often give prominence to hoaxes and conspiracy theories. After YouTube drew controversy for giving top billing to videos promoting falsehoods and conspiracy when people made breaking-news queries during the 2017 Las Vegas shooting, YouTube changed its algorithm to give greater prominence to mainstream media sources. In 2018, it was reported that YouTube was again promoting fringe content about breaking news, giving great prominence to conspiracy videos about Anthony Bourdain's death.
More InfoFive leading content creators whose channels were based on LGBTQ+ materials filed a federal lawsuit against YouTube in August 2019, alleging that YouTube's algorithms diverts discovery away from their channels, impacting their revenue. The plaintiffs claimed that the algorithms discourage content with words like "lesbian" or "gay", which would be predominant in their channels' content, and because of YouTube's near-monopolization of online video services, they are abusing that position.
More InfoIn January 2018, YouTube creator Logan Paul faced criticism for a video he had uploaded from a trip to Japan, where he encountered a body of a suicide death in the Aokigahara forest. The corpse was visible in the video, although its face was censored. The video proved controversial due to its content, with its handling of the subject matter being deemed insensitive by critics. On January 10—eleven days after the video was published—YouTube announced that it would cut Paul from the Google Preferred advertising program. Six days later, YouTube announced tighter thresholds for the partner program to "significantly improve our ability to identify creators who contribute positively to the community", under which channels must have at least 4,000 hours of watch time within the past 12 months and at least 1,000 subscribers. YouTube also announced that videos approved for the Google Preferred program would become subject to manual review, and that videos would be rated based on suitability (with advertisers allowed to choose).
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