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Wikipedia ( or ) is a free-access, free-content Internet encyclopedia, supported and hosted by the non-profit Wikimedia Foundation. Those who can access the site can edit most of its articles.〔(【引用サイトリンク】url = http://www.theverge.com/2015/9/4/9260981/jimmy-wales-wikipedia-china )〕 Wikipedia is ranked among the ten most popular websites〔 and constitutes the Internet's largest and most popular general reference work.〔〔 Jimmy Wales and Larry Sanger launched Wikipedia on January 15, 2001. Sanger〔 coined its name, a portmanteau of ''wiki'' and encyclo''pedia''. Initially only in English, Wikipedia quickly became multilingual as it developed similar versions in other languages, which differ in content and in editing practices. The English Wikipedia is now one of 291 Wikipedia editions and is the largest with articles (having reached 5,000,000 articles in November 2015). There is a grand total, including all Wikipedias, of over 37 million articles in over 250 different languages.〔(【引用サイトリンク】title=Wikipedia cofounder Jimmy Wales on 60 Minutes )〕 As of February 2014, it had 18 billion page views and nearly 500 million unique visitors each month.〔 Supporters of Wikipedia cite a 2005 survey of Wikipedia published in ''Nature'' based on a comparison of 42 science articles with ''Encyclopædia Britannica'', which found that Wikipedia's level of accuracy approached ''Encyclopedia Britannica''s.〔 Criticisms of Wikipedia include claims that it exhibits systemic bias, presents a mixture of "truths, half truths, and some falsehoods",〔 and is subject to manipulation and spin.〔 == History == (詳細はtitle=The contribution conundrum: Why did Wikipedia succeed while other encyclopedias failed? )〕 Wikipedia began as a complementary project for Nupedia, a free online English-language encyclopedia project whose articles were written by experts and reviewed under a formal process. Nupedia was founded on March 9, 2000, under the ownership of Bomis, a web portal company. Its main figures were the Bomis Jimmy Wales and Larry Sanger, editor-in-chief for Nupedia and later Wikipedia. Nupedia was licensed initially under its own Nupedia Open Content License, switching to the GNU Free Documentation License before Wikipedia's founding at the urging of Richard Stallman.〔 Sanger and Wales founded Wikipedia.〔〔 While Wales is credited with defining the goal of making a publicly editable encyclopedia,〔〔 Sanger is credited with the strategy of using a wiki to reach that goal.〔(【引用サイトリンク】title=Wikipedia-l: LinkBacks? )〕 On January 10, 2001, Sanger proposed on the Nupedia mailing list to create a wiki as a "feeder" project for Nupedia. Wikipedia was formally launched on January 15, 2001, as a single English-language edition at www.wikipedia.com,〔 and announced by Sanger on the Nupedia mailing list.〔 Wikipedia's policy of "neutral point-of-view"〔 was codified in its first months. Otherwise, there were relatively few rules initially and Wikipedia operated independently of Nupedia.〔 Originally, Bomis intended to make Wikipedia a business for profit. Wikipedia gained early contributors from Nupedia, Slashdot postings, and web search engine indexing. By August 8, 2001, Wikipedia had over 8,000 articles. On September 25, 2001, Wikipedia had over 13,000 articles. And by the end of 2001 it had grown to approximately 20,000 articles and 18 language editions. It had reached 26 language editions by late 2002, 46 by the end of 2003, and 161 by the final days of 2004. Nupedia and Wikipedia coexisted until the former's servers were taken down permanently in 2003, and its text was incorporated into Wikipedia. English Wikipedia passed the mark of two million articles on September 9, 2007, making it the largest encyclopedia ever assembled, surpassing even the 1408 Yongle Encyclopedia, which had held the record for almost 600 years.〔 Citing fears of commercial advertising and lack of control in Wikipedia, users of the Spanish Wikipedia forked from Wikipedia to create the ''Enciclopedia Libre'' in February 2002.〔(【引用サイトリンク】) Enciclopedia Libre: msg#00008">url=http://osdir.com/ml/science.linguistics.wikipedia.international/2003-03/msg00008.html )〕 These moves encouraged Wales to announce that Wikipedia would not display advertisements, and to change Wikipedia's domain from ''wikipedia.com'' to ''wikipedia.org''.〔 Though the English Wikipedia reached three million articles in August 2009, the growth of the edition, in terms of the numbers of articles and of contributors, appears to have peaked around early 2007. Around 1,800 articles were added daily to the encyclopedia in 2006; by 2013 that average was roughly 800. A team at the Palo Alto Research Center attributed this slowing of growth to the project's increasing exclusivity and resistance to change. Others suggest that the growth is flattening naturally because articles that could be called "low-hanging fruit"—topics that clearly merit an article—have already been created and built up extensively.〔Austin Gibbons, David Vetrano, Susan Biancani (2012). (Wikipedia: Nowhere to grow ) 〕 In November 2009, a researcher at the Rey Juan Carlos University in Madrid (Spain) 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.〔Volunteers Log Off as Wikipedia Ages, The Wall Street Journal, November 27, 2009.〕 Wales disputed these claims in 2009, denying the decline and questioning the methodology of the study. Two years later, 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 claim which was questioned by MIT's ''Technology Review'' in a 2013 article titled "The Decline of Wikipedia." 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 2013, MIT's ''Technology Review'' revealed that since 2007, the site has lost a third of the volunteer editors who update and correct the online encyclopedia's millions of pages and those still there have focused increasingly on minutiae."〔Ward, Katherine. ''New York'' Magazine, issue of November 25, 2013, p. 18.〕 In January 2007, Wikipedia entered for the first time the top-ten list of the most popular websites in the United States, according to comScore Networks. With 42.9 million unique visitors, Wikipedia was ranked number 9, surpassing the ''New York Times'' (#10) and Apple (#11). This marked a significant increase over January 2006, when the rank was number 33, with Wikipedia receiving around 18.3 million unique visitors.〔(【引用サイトリンク】title=Wikipedia Breaks Into US Top 10 Sites )〕 , Wikipedia has rank 6〔〔(【引用サイトリンク】title=Wikipedia.org Site Overview )〕 among websites in terms of popularity according to Alexa Internet. In 2014, it received 8 billion pageviews every month.〔(【引用サイトリンク】title=Wikimedia Traffic Analysis Report – Wikipedia Page Views Per Country )〕 On February 9, 2014, ''The New York Times'' reported that Wikipedia has 18 billion page views and nearly 500 million unique visitors a month, "according to the ratings firm comScore." On January 18, 2012, the English Wikipedia participated in a series of coordinated protests against two proposed laws in the United States Congress—the Stop Online Piracy Act (SOPA) and the PROTECT IP Act (PIPA)—by blacking out its pages for 24 hours. More than 162 million people viewed the blackout explanation page that temporarily replaced Wikipedia content.〔(【引用サイトリンク】title=SOPA/Blackoutpage )〕 Loveland and Reagle argue that, in process, Wikipedia follows a long tradition of historical encyclopedias that accumulated improvements piecemeal through "stigmergic accumulation". On January 20, 2014, Subodh Varma reporting for ''The Economic Times'' indicated that not only had Wikipedia growth flattened but that it has "lost nearly 10 per cent of its page-views last year. That's a decline of about 2 billion between December 2012 and December 2013. Its most popular versions are leading the slide: page-views of the English Wikipedia declined by 12 per cent, those of German version slid by 17 per cent and the Japanese version lost 9 per cent." Varma added that, "While Wikipedia's managers think that this could be due to errors in counting, other experts feel that Google's Knowledge Graphs project launched last year may be gobbling up Wikipedia users."〔 When contacted on this matter, Clay Shirky, associate professor at New York University and fellow at Harvard's Berkman Center for internet and Security indicated that he suspected much of the page view decline was due to Knowledge Graphs, stating, "If you can get your question answered from the search page, you don't need to click (further )."〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wikipedia」の詳細全文を読む スポンサード リンク
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