( CNN ) -- They 've long been considered topics that are n't polite to discuss at the dinner table . As it turns out , politics and religion can get touchy on Wikipedia as well . The two topics dominated a list of the most controversial pages on the crowdsourced Web encyclopedia . Topping the English-language version of the list ? Former President George W. Bush . To determine the most controversial pages , researchers from Oxford University looked at their number of `` reverts '' -- instances in which an editor changes something on a page , only to have someone else come along and change it back to the previous wording . Alongside Bush , the political philosophy of anarchism made the list . So did global warming and the United States -- two topics that , while not exclusively political , certainly have political elements . As for religion , Mohammed , Jesus and Christianity were all among the top 10 . Circumcision and `` race and intelligence , '' both with obvious controversy attached , made the list , alongside a possibly more surprising page : a list of professional wrestlers on the roster of World Wrestling Entertainment . The authors of the study , which will be part of an upcoming book , said that on a site as expansive and ambitious as Wikipedia , disagreements are bound to happen . `` While the common aim in the collaboration is clear , unavoidably differences in opinions and views occur , leading to controversies , '' they wrote . `` Clearly , there is a positive role of the conflicts : if they can be resolved in a consensus , the resulting product will better reflect the state of the art than without fighting them out . `` However , there are examples , where no hope for a consensus seems in sight -- then the struggle strongly limits efficiency . '' The guiding principle behind Wikipedia , which launched in 2001 , is cooperation . The thinking is that with a team of volunteer editors spanning the globe , rough edges will eventually be smoothed out and good information will triumph over falsehoods and misinterpretations . With more than 470 million unique visitors monthly , Wikipedia is one of the most-visited sites on the Web . It 's written and edited collaboratively by Internet volunteers , most of them anonymous . According to its own pages , the site has more than 77,000 active contributors working on more than 22 million articles in 285 languages . By default , any change that an editor makes on the site is published immediately , subject to cleaning up by editors who come afterward . But disagreements , even among well-meaning editors , are bound to happen and , over the years , Wikipedia has adopted rules to deal with them . On the English-language version , only registered users may create new articles . And certain controversial pages get `` protection '' -- either full protection , which means they can only be edited by administrators , or semi-protection , under which they can only be edited by logged-in users whose accounts have been verified . When pages become home to `` edit wars , '' as the entries for Bush and Democratic rival John Kerry did during the 2004 election , they may be given temporary protection by administrators . On the English-language version of the site , sweeping issues such as religion dominated the most-disputed list . But the study 's authors noted that with most other languages , more local or regional topics prevailed . `` The English Wikipedia , in particular , occupies a unique role , '' they wrote . `` The language 's status as a 'lingua franca ' ( a widely used working language ) means that English Wikipedia ends up being edited by a broad community beyond simply ( those ) that have the language as a mother tongue . '' In German , the page on Croatia was the most controversial , with Adolf Hitler , Scientology and Austrian philosopher Rudolf Steiner making the top 10 . Socialist politician Segolene Royal topped the French list ( followed , curiously , by UFOs ) and `` Gypsy crime '' topped the Hungarian list . In an interesting look at cultural interests , five of the 10 most disputed pages in Spanish were those of soccer teams -- Club America , Athletic Bilbao , Newell 's Old Boys , FC Barcelona and Alianza Lima .
George W. Bush tops list of most controversial English-language Wiki pages . Analysis looked at Wikipedia pages with most frequent changes . Score: 6 A pro wrestling page also made the list .