List of Wikipedia controversies

Since the launch of Wikipedia in 2001, it has faced several controversies. Wikipedia's open-editing model, which allows any user to edit its encyclopedic pages, has led to concerns such as the quality of writing, the amount of vandalism, and the accuracy of information on the project. The media have covered controversial events and scandals related to Wikipedia and its funding organization, the Wikimedia Foundation (WMF). Common subjects of coverage include articles containing false information, public figures, corporations editing articles for which they have a conflict of interest, paid Wikipedia editing and hostile interactions between Wikipedia editors and public figures.
The Seigenthaler biography incident led to increased media criticism of the reliability of Wikipedia. The incident dates back to May 2005, with the anonymous posting of a hoax Wikipedia article containing false and negative allegations about John Seigenthaler, a well-known American journalist. In March 2007, Wikipedia was again the subject of media attention with the Essjay controversy, which involved a prominent English Wikipedia editor and administrator, who claimed he was a "tenured professor of religion at a private university" with a "Ph.D. in theology and a degree in canon law" when in fact he was a 24-year-old who held no advanced degrees.
The 2012 scandals involving paid consultancy for the government of Gibraltar by Roger Bamkin, a Wikimedia UK board member, and potential conflicts of interest have highlighted Wikipedia's vulnerabilities. The presence of inaccurate and false information, as well as the perceived hostile editing climate, have been linked to a decline in editor participation. Another controversy arose in 2013 after an investigation by Wikipedians found that the Wiki-PR company had edited Wikipedia for paying clients, using "an army" of sockpuppet accounts that purportedly included 45 Wikipedia editors and administrators. In 2015, the Orangemoody investigation showed that businesses and minor celebrities had been blackmailed over their Wikipedia articles by a coordinated group of fraudsters, again using hundreds of sockpuppets. Controversies within and concerning Wikipedia and the WMF have been the subject of several scholarly papers. This list is a collection of the more notable instances.
The nature of Wikipedia controversies has been analyzed by scholars. Sociologist Howard Rheingold says that "Wikipedia controversies have revealed the evolution of social mechanisms in the Wikipedia community"; a study of the politicization of socio-technical spaces remarked that Wikipedia "controversies ... become fully-fledged when they are advertised outside the page being debated"; and one college discusses Wikipedia as a curricular tool, in that "recent controversies involving Wikipedia [are used] as a basis for discussion of ethics and bias."
Despite being promoted as an encyclopedia "anyone can edit", the ability to edit controversial pages is sometimes restricted because of "edit wars" or vandalism. To address criticism about restricting access while minimizing malicious editing of those pages, Wikipedia has also tried measures such as "pending changes protection" which allows open editing of contentious articles, with the caveat that an experienced editor must approve new users' edits before they become visible to the public.