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Wikipedia is a free,[5] web-based and collaborative multilingual encyclopedia project supported by the non-profit Wikimedia Foundation. Its name is a portmanteau of the words wiki (a technology for creating collaborative websites, from the Hawaiian word wiki, meaning "quick") and encyclopedia. Wikipedia's 13 million articles (3 million in English) have been written collaboratively by volunteers around the world, and almost all of its articles can be edited by anyone who can access the Wikipedia website.[6] Launched in 2001 by Jimmy Wales and Larry Sanger,[7] it is currently the largest and most popular general reference work on the Internet.[3][8][9][10]
Critics of Wikipedia accuse it of systemic bias and inconsistencies (including undue weight given to popular culture),[11] and allege that it favors consensus over credentials in its editorial process.[12] Wikipedia's reliability and accuracy are also an issue.[13] Other criticisms center on its susceptibility to vandalism and the addition of spurious or unverified information,[14] though scholarly work suggests that vandalism is generally short-lived.[15][16]
Wikipedia's departure from the expert-driven style of the encyclopedia building mode and the large presence of unacademic contents have been noted several times. When Time magazine recognized You as its Person of the Year for 2006, acknowledging the accelerating success of online collaboration and interaction by millions of users around the world, it cited Wikipedia as one of three examples of Web 2.0 services, along with YouTube and MySpace.[17] Some noted the importance of Wikipedia not only as an encyclopedic reference but also as a frequently updated news resource because of how quickly articles about recent events appear.[18][19]
Contents [hide]
1 History
2 Nature of Wikipedia
2.1 Editing model
2.2 Consequence of the open editing model
2.3 Coverage of topics
2.4 Wikipedia community
3 Operation
3.1 Wikimedia Foundation and the Wikimedia chapters
3.2 Software and hardware
3.3 Delivery media
4 License and language editions
5 Cultural significance
6 Related projects
7 See also
8 Notes
9 References
10 External links
History

Main article: History of Wikipedia

Wikipedia originally developed from another encyclopedia project, Nupedia.
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, Inc, a web portal company. Its main figures were Jimmy Wales, Bomis CEO, 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.[20]
Larry Sanger and Jimmy Wales are the founders of Wikipedia.[21][22] While Wales is credited with defining the goal of making a publicly editable encyclopedia,[23][24] Sanger is usually credited with the strategy of using a wiki to reach that goal.[25] On January 10, 2001, Larry Sanger proposed on the Nupedia mailing list to create a wiki as a "feeder" project for Nupedia.[26] Wikipedia was formally launched on January 15, 2001, as a single English-language edition at www.wikipedia.com,[27] and announced by Sanger on the Nupedia mailing list.[23] Wikipedia's policy of "neutral point-of-view"[28] was codified in its initial months, and was similar to Nupedia's earlier "nonbiased" policy. Otherwise, there were relatively few rules initially and Wikipedia operated independently of Nupedia.[23]

Graph of the article count for the English Wikipedia, from January 10, 2001, to September 9, 2007 (the date of the two-millionth article)
Wikipedia gained early contributors from Nupedia, Slashdot postings, and web search engine indexing. It grew to approximately 20,000 articles, and 18 language editions, by the end of 2001. By late 2002 it had reached 26 language editions, 46 by the end of 2003, and 161 by the final days of 2004.[29] 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 2 million-article mark on September 9, 2007, making it the largest encyclopedia ever assembled, eclipsing even the Yongle Encyclopedia (1407), which had held the record for exactly 600 years.[30]
Citing fears of commercial advertising and lack of control in a perceived English-centric Wikipedia, users of the Spanish Wikipedia Forked from Wikipedia to create the Enciclopedia Libre in February 2002.[31] Later that year, Wales announced that Wikipedia would not display advertisements, and its website was moved to wikipedia.org.[32] Various other projects have since forked from Wikipedia for editorial reasons. Wikinfo does not require a neutral point of view and allows original research. New Wikipedia-inspired projects - such as Citizendium, Scholarpedia, Conservapedia, and Google's Knol[33] - have been started to address perceived limitations of Wikipedia, such as its policies on peer review, original research, and commercial advertising.
Though the English Wikipedia reached 3 million articles in August 2009, the growth of the edition, in terms of the numbers of articles and of contributors, appeared to have abruptly flattened around Spring 2007.[34] In July 2007 about 2,200 articles were added daily to the encyclopedia; today that average is 1,300. A team led by Ed H Chi at the Palo Alto Research Center speculated that this is due to the increasing exclusiveness of the project. New or occasional editors have significantly higher rates of their edits reverted than an "elite" group of regular editors. This makes it difficult for the project to recruit and retain new contributors, resulting in the stagnation in article creation.
Nature of Wikipedia

Editing model

In April 2009, the Wikimedia Foundation conducted a Wikipedia usability study, questioning users about the editing mechanism.[35]
In departure from the style of traditional encyclopedias such as Encyclopædia Britannica, Wikipedia employs the open editing model called "wiki". Except for a few vandalism-prone pages that can be edited only by established users, or in extreme cases only by administrators, every article may be edited anonymously or with a user account, while only registered users may create a new article (only in English edition). No article is owned by its creator or any other editor, or is vetted by any recognized authority; rather, the articles are collectively owned by a community of editors. [36]
Most importantly, when changes to an article are made, they become available immediately before undergoing any review, no matter if they contain an error, are somehow misguided or even patent nonsense. The German edition of Wikipedia is an exception to this rule: it has been testing a system of maintaining "stable versions" of articles,[37] to allow a reader to see versions of articles that have passed certain reviews. Other language editions have not reached a consensus to implement this "flagged revisions" proposal.[38][39] Another proposal is the use of software to create "trust ratings" for individual Wikipedia contributors and using those ratings to determine which changes will be made visible immediately.[40]

Editors keep track of changes to articles by checking the difference between two revisions of a page, displayed here in red.
Contributors, registered or not, can take advantage of features available in the software that powers Wikipedia. The "History" page attached to each article records every single past revision of the article, though a revision with libelous content, criminal threats or copyright infringements may be removed afterwards.[41][42] This feature makes it easy to compare old and new versions, undo changes that an editor considers undesirable, or restore lost content. The "Discussion" pages associated with each article are used to coordinate work among multiple editors.[43] Regular contributors often maintain a "watchlist" of articles of interest to them, so that they can easily keep tabs on all recent changes to those articles. Computer programs called Internet bots have been used widely to remove vandalism as soon as it was made,[16] to correct common misspellings and stylistic issues, or to start articles such as geography entries in a standard format from statistical data.
Articles in Wikipedia are organized roughly in three ways: according to their development statuses, their subject matters and the access levels required for edits. The most developed state of articles is called "featured article": they are precisely ones that someday get featured in the main page of Wikipedia.[44][45] Researcher Giacomo Poderi found that articles tend to reach the FA status via intensive works of few editors, and that the categories such as history, media, music and warfare have higher ratio of featured articles than those such as computing, mathematics, language & linguistics and philosophy & psychology, casting a doubt to the equation "more edits equal higher quality." In 2007, in preparation for producing a print version, the English-language Wikipedia introduced an assessment scale against which the quality of articles is judged;[46] other editions have also adopted this.
In 2008, two researchers theorized that the growth of Wikipedia is sustainable.[47]
Consequence of the open editing model
See also: Reliability of Wikipedia, Criticism of Wikipedia, Academic studies of Wikipedia.
The open nature of the editing model has been central to most criticism of Wikipedia. For example, at any point, a reader of an article cannot be certain whether or not the article she is reading has been vandalized. Former Encyclopaedia Britannica editor-in-chief Robert McHenry once described this by saying:[48]
The user who visits Wikipedia to learn about some subject, to confirm some matter of fact, is rather in the position of a visitor to a public restroom. It may be obviously dirty, so that he knows to exercise great care, or it may seem fairly clean, so that he may be lulled into a false sense of security. What he certainly does not know is who has used the facilities before him.
and popularized the claim that Wikipedia is a "faith-based encyclopedia."[citation needed] Critics argue that non-expert editing undermines quality. Because contributors usually rewrite small portions of an entry rather than making full-length revisions, high- and low-quality content may be intermingled within an entry. Historian Roy Rosenzweig noted: "Overall, writing is the Achilles' heel of Wikipedia. Committees rarely write well, and Wikipedia entries often have a choppy quality that results from the stringing together of sentences or paragraphs written by different people."[49] All of these led to the question of the reliability of Wikipedia as a source of accurate information.

John Seigenthaler has described Wikipedia as "a flawed and irresponsible research tool."[50]
As a consequence of the open structure, Wikipedia "makes no guarantee of validity" of its content, since no one is ultimately responsible for any claims appearing in it.[51] Concerns have been raised regarding the lack of accountability that results from users' anonymity,[52] the insertion of spurious information, vandalism, and similar problems. In one particularly well-publicized incident, false information was introduced into the biography of American political figure John Seigenthaler and remained undetected for four months.[50] John Seigenthaler, the founding editorial director of USA Today and founder of the Freedom Forum First Amendment Center at Vanderbilt University, called Jimmy Wales and asked him, "...Do you ...have any way to know who wrote that?" "No, we don't", said Jimmy.[53]
Some critics claim that Wikipedia's open structure makes it an easy target for Internet trolls, spams, and those with an agenda to push.[41][54] The addition of political spin to articles by organizations including members of the U.S. House of Representatives and special interest groups[14] has been noted,[55] and organizations such as Microsoft have offered financial incentives to work on certain articles.[56] These issues have been parodied, notably by Stephen Colbert in The Colbert Report.[57]
Coverage of topics
See also: Notability in Wikipedia.
As an encyclopedia building project, Wikipedia seeks to create a summary of all human knowledge: all of topics covered by a conventional print encyclopedia plus any other "notable" (therefore verifiable by published sources) topics, which are permitted by unlimited disk space.[58] In particular, it contains materials that some people, including Wikipedia editors,[59] may find objectionable, offensive, or pornographic.[60] It was made clear that this policy is not up for debate, and the policy has sometimes proved controversial. For instance, in 2008, Wikipedia rejected an online petition against the inclusion of Muhammad's depictions in its English edition, citing this policy. The presence of politically sensitive materials in Wikipedia had also led the People's Republic of China to block access to parts of the site.[61] (See also: IWF block of Wikipedia)
Content in Wikipedia is subject to the laws (in particular copyright law) in Florida, where Wikipedia servers are hosted, and several editorial policies and guidelines that are intended to reinforce the notion that Wikipedia is an encyclopedia. Each entry in Wikipedia must be about a topic that is encyclopedic and thus is worthy of inclusion. A topic is deemed encyclopedic if it is "notable"[62] in the Wikipedia jargon; i.e., if it has received significant coverage in secondary reliable sources (i.e., mainstream media or major academic journals) that are independent of the subject of the topic. Second, Wikipedia must expose knowledge that is already established and recognized.[63] In other words, it must not present, for instance, new information or original works. A claim that is likely to be challenged requires a reference to reliable sources. Within the Wikipedia community, this is often phrased as "verifiability, not truth" to express the idea that the readers are left themselves to check the truthfulness of what appears in the articles and to make their own interpretations.[64] Finally, Wikipedia does not take a side.[65] All opinions and viewpoints, if attributable to external sources, must enjoy appropriate share of coverage within an article.[66] Wikipedia editors as a community write and revise those policies and guidelines[67] and enforce them by deleting, annotating with tags, or modifying article materials failing to meet them. (See also deletionism and inclusionism)[68][69]
However, Wikipedia has been accused of exhibiting systemic bias and inconsistency;[13] critics argue that Wikipedia's open nature and a lack of proper sources for much of the information makes it unreliable.[70] Some commentators suggest that Wikipedia is generally reliable, but that the reliability of any given article is not always clear.[12] Editors of traditional reference works such as the Encyclopædia Britannica have questioned the project's utility and status as an encyclopedia.[71] Many university lecturers discourage students from citing any encyclopedia in academic work, preferring primary sources;[72] some specifically prohibit Wikipedia citations.[73] Co-founder Jimmy Wales stresses that encyclopedias of any type are not usually appropriate as primary sources, and should not be relied upon as authoritative.[74]
Andrew Lih, author of the 2009 book The Wikipedia Revolution, notes: "A wiki has all its activities happening in the open for inspection... Trust is built by observing the actions of others in the community and discovering people with like or complementary interests."[75] Economist Tyler Cowen writes, "If I had to guess whether Wikipedia or the median refereed journal article on economics was more likely to be true, after a not so long think I would opt for Wikipedia." He comments that many traditional sources of non-fiction suffer from systemic biases. Novel results are over-reported in journal articles, and relevant information is omitted from news reports. However, he also cautions that errors are frequently found on Internet sites, and that academics and experts must be vigilant in correcting them.[76]
In February 2007, an article in The Harvard Crimson newspaper reported that some of the professors at Harvard University include Wikipedia in their syllabus, but that there is a split in their perception of using Wikipedia.[77] In June 2007, former president of the American Library Association Michael Gorman condemned Wikipedia, along with Google,[78] stating that academics who endorse the use of Wikipedia are "the intellectual equivalent of a dietitian who recommends a steady diet of Big Macs with everything". He also said that "a generation of intellectual sluggards incapable of moving beyond the Internet" was being produced at universities. He complains that the web-based sources are discouraging students from learning from the more rare texts which are either found only on paper or are on subscription-only web sites. In the same article Jenny Fry (a research fellow at the Oxford Internet Institute) commented on academics who cite Wikipedia, saying that: "You cannot say children are intellectually lazy because they are using the Internet when academics are using search engines in their research. The difference is that they have more experience of being critical about what is retrieved and whether it is authoritative. Children need to be told how to use the Internet in a critical and appropriate way."[78]
Wikipedia community
The Wikipedia community has established "a bureaucracy of sorts", including "a clear power structure that gives volunteer administrators the authority to exercise editorial control."[79][80][81] Wikipedia's community has also been described as "cult-like",[82] although not always with entirely negative connotations,[83] and criticized for failing to accommodate inexperienced users.[84] Editors in good standing in the community can run for one of many levels of volunteer stewardship; this begins with "administrator",[85][86] a group of privileged users who have the ability to delete pages, lock articles from being changed in case of vandalism or editorial disputes, and block users from editing. Despite the name, administrators do not enjoy any special privilege in decision-making; instead they are mostly limited to making edits that have project-wide effects and thus are disallowed to ordinary editors, and to ban users making disruptive edits (such as vandalism).[87]

Wikimania, an annual conference for users of Wikipedia and other projects operated by the Wikimedia Foundation.
As Wikipedia grows with an unconventional model of encyclopedia building, "Who writes Wikipedia?" has become one of the questions frequently asked on the project, often with a reference to other Web 2.0 projects such as Digg.[88] Jimmy Wales once argued that only "a community ... a dedicated group of a few hundred volunteers" makes the bulk of contributions to Wikipedia and that the project is therefore "much like any traditional organization". Wales performed a study finding that over 50% of all the edits are done by just .7% of the users (at the time: 524 people). This method of evaluating contributions was later disputed by Aaron Swartz, who noted that several articles he sampled had large portions of their content (measured by number of characters) contributed by users with low edit counts.[89] A 2007 study by researchers from Dartmouth College found that "anonymous and infrequent contributors to Wikipedia ... are as reliable a source of knowledge as those contributors who register with the site."[90] Although some contributors are authorities in their field, Wikipedia requires that even their contributions be supported by published and verifiable sources. The project's preference for consensus over credentials has been labeled "anti-elitism".[11]
In August 2007, WikiScanner, a website developed by Virgil Griffith began to trace the sources of changes made to Wikipedia by anonymous editors without Wikipedia accounts. The program revealed that many such edits were made by corporations or government agencies changing the content of articles related to them, their personnel or their work.[91]
In a 2003 study of Wikipedia as a community, economics Ph.D. student Andrea Ciffolilli argued that the low transaction costs of participating in wiki software create a catalyst for collaborative development, and that a "creative construction" approach encourages participation.[92] In his 2008 book, The Future of the Internet and How to Stop It, Jonathan Zittrain of the Oxford Internet Institute and Harvard Law School's Berkman Center for Internet & Society cites Wikipedia's success as a case study in how open collaboration has fostered innovation on the web.[93] A 2008 study found that Wikipedia users were less agreeable and open, though more conscientious, than non-Wikipedia users.[94][95] A 2009 study suggested there was "evidence of growing resistance from the Wikipedia community to new content."[96]
The Wikipedia Signpost is the community newspaper on the English Wikipedia,[97] and was founded by Michael Snow, an administrator and the current chair of the Wikimedia Foundation board of trustees.[98] It covers news and events from the site, as well as major events from sister projects, such as Wikimedia Commons.[99]
Operation

Wikimedia Foundation and the Wikimedia chapters

Wikimedia Foundation logo
Wikipedia is hosted and funded by the Wikimedia Foundation, a non-profit organization which also operates Wikipedia-related projects such as Wikibooks. The Wikimedia chapters, local associations of Wikipedia users, also participate in the promotion, the development, and the funding of the project.
Software and hardware
The operation of Wikipedia depends on MediaWiki, a custom-made, free and open source wiki software platform written in PHP and built upon the MySQL database.[100] The software incorporates programming features such as a macro language, variables, a transclusion system for templates, and URL redirection. MediaWiki is licensed under the GNU General Public License and used by all Wikimedia projects, as well as many other wiki projects. Originally, Wikipedia ran on UseModWiki written in Perl by Clifford Adams (Phase I), which initially required CamelCase for article hyperlinks; the present double bracket style was incorporated later. Starting in January 2002 (Phase II), Wikipedia began running on a PHP wiki engine with a MySQL database; this software was custom-made for Wikipedia by Magnus Manske. The Phase II software was repeatedly modified to accommodate the exponentially increasing demand. In July 2002 (Phase III), Wikipedia shifted to the third-generation software, MediaWiki, originally written by Lee Daniel Crocker. Several MediaWiki extensions are installed[101] to extend the functionality of MediaWiki software. In April 2005 a Lucene extension[102][103] was added to MediaWiki's built-in search and Wikipedia switched from MySQL to Lucene for searching. Currently Lucene Search 2,[104] which is written in Java and based on Lucene library 2.0,[105] is used.

Overview of system architecture, April 2009. See server layout diagrams on Meta-Wiki.
Wikipedia currently runs on dedicated clusters of Linux servers (mainly Ubuntu),[106][107] with a few OpenSolaris machines for ZFS. As of February 2008, there were 300 in Florida, 26 in Amsterdam, and 23 in Yahoo!'s Korean hosting facility in Seoul.[108] Wikipedia employed a single server until 2004, when the server setup was expanded into a distributed multitier architecture. In January 2005, the project ran on 39 dedicated servers located in Florida. This configuration included a single master database server running MySQL, multiple slave database servers, 21 web servers running the Apache HTTP Server, and seven Squid cache servers.
Wikipedia receives between 25,000 and 60,000 page requests per second, depending on time of day.[109] Page requests are first passed to a front-end layer of Squid caching servers.[110] Requests that cannot be served from the Squid cache are sent to load-balancing servers running the Linux Virtual Server software, which in turn pass the request to one of the Apache web servers for page rendering from the database. The web servers deliver pages as requested, performing page rendering for all the language editions of Wikipedia. To increase speed further, rendered pages are cached in a distributed memory cache until invalidated, allowing page rendering to be skipped entirely for most common page accesses. Two larger clusters in the Netherlands and Korea now handle much of Wikipedia's traffic load.
Delivery media
Wikipedia's original medium was for users to read and edit content using any standard web browser through a fixed internet connection. However, Wikipedia content is now also accessible through offline media, and through the mobile web.
On mobile devices access to Wikipedia from mobile phones was possible as early as 2004, through the Wireless Application Protocol (WAP), through the Wapedia service. In June 2007, Wikipedia launched en.mobile.wikipedia.org, an official website for wireless devices. In 2009 a newer mobile service was officially released,[111] located at en.m.wikipedia.org, which caters to more advanced mobile devices such as the iPhone, Android-based devices, or the Palm Pre. Several other methods of mobile access to Wikipedia have emerged (See Wikipedia:Mobile access). Several devices and applications optimise or enhance the display of Wikipedia content for mobile devices, while some also incorporate additional features such as use of Wikipedia metadata (See Wikipedia:Metadata), such as geoinformation.[112]
Collections of Wikipedia articles have been published on optical disks. An English version, 2006 Wikipedia CD Selection, contained about 2,000 articles.[113][114] The Polish version contains nearly 240,000 articles.[115] There are also German versions.[116]
License and language editions

See also: List of Wikipedias
All text in Wikipedia was covered by GNU Free Documentation License (GFDL), a copyleft license permitting the redistribution, creation of derivative works, and commercial use of content while authors retain copyright of their work,[117] up until June 2009, when the site switched to Creative Commons Attribution-ShareAlike (CC-by-SA) 3.0.[118] Wikipedia had been working on the switch to Creative Commons licenses because the GFDL, initially designed for software manuals, is not suitable for online reference works and because the two licenses were incompatible.[119] In response to the Wikimedia Foundation's request, in November 2008, the Free Software Foundation (FSF) released a new version of GFDL designed specifically to allow Wikipedia to relicense its content to CC-BY-SA by August 1, 2009. Wikipedia and its sister projects held a community-wide referendum to decide whether or not to make the license switch.[120] The referendum took place from April 9 to 30.[121] The results were 75.8% "Yes", 10.5% "No", and 13.7% "No opinion".[122] In consequence of the referendum, the Wikimedia Board of Trustees voted to change to the Creative Commons license, effective June 15, 2009.[122] The position that Wikipedia is merely a hosting service has been successfully used as a defense in court.[123][124]

Percentage of all Wikipedia articles in English (red) and top ten largest language editions (blue). As of July 2007, less than 23% of Wikipedia articles are in English.
The handling of media files (e.g., image files) varies across language editions. Some language editions, such as the English Wikipedia, include non-free image files under fair use doctrine, while the others have opted not to. This is in part because of the difference in copyright laws between countries; for example, the notion of fair use does not exist in Japanese copyright law. Media files covered by free content licenses (e.g., Creative Commons' cc-by-sa) are shared across language editions via Wikimedia Commons repository, a project operated by the Wikimedia Foundation.
There are currently 262 language editions of Wikipedia; of these, 24 have over 100,000 articles and 81 have over 1,000 articles.[1] According to Alexa, the English subdomain (en.wikipedia.org; English Wikipedia) receives approximately 52% of Wikipedia's cumulative traffic, with the remaining split among the other languages (Spanish: 19%, French: 5%, Polish: 3%, German: 3%, Japanese: 3%, Portuguese: 2%).[3] As of July 2008, the five largest language editions are (in order of article count) English, German, French, Polish, and Japanese Wikipedias.[125]
Since Wikipedia is web-based and therefore worldwide, contributors of a same language edition may use different dialects or may come from different countries (as is the case for the English edition). These differences may lead to some conflicts over spelling differences, (e.g. color vs. colour)[126] or points of view.[127] Though the various language editions are held to global policies such as "neutral point of view," they diverge on some points of policy and practice, most notably on whether images that are not licensed freely may be used under a claim of fair use.[128][129][130]

Contributors for English Wikipedia by country as of September 2006.[131]
Jimmy Wales has described Wikipedia as "an effort to create and distribute a free encyclopedia of the highest possible quality to every single person on the planet in their own language".[132] Though each language edition functions more or less independently, some efforts are made to supervise them all. They are coordinated in part by Meta-Wiki, the Wikimedia Foundation's wiki devoted to maintaining all of its projects (Wikipedia and others).[133] For instance, Meta-Wiki provides important statistics on all language editions of Wikipedia,[134] and it maintains a list of articles every Wikipedia should have.[135] The list concerns basic content by subject: biography, history, geography, society, culture, science, technology, foodstuffs, and mathematics. As for the rest, it is not rare for articles strongly related to a particular language not to have counterparts in another edition. For example, articles about small towns in the United States might only be available in English.
Translated articles represent only a small portion of articles in most editions, in part because automated translation of articles is disallowed.[136] Articles available in more than one language may offer "InterWiki" links, which link to the counterpart articles in other editions.
Cultural significance

Graph showing the number of days between every 10,000,000th edit.

Wikipedia shown in Weird Al's music video for his song "White & Nerdy".
Main article: Wikipedia in culture
In addition to logistic growth in the number of its articles,[137] Wikipedia has steadily gained status as a general reference website since its inception in 2001.[138] According to Alexa and comScore, Wikipedia is among the ten most visited websites worldwide.[10][139] Of the top ten, Wikipedia is the only non-profit website. The growth of Wikipedia has been fueled by its dominant position in Google search results;[140] about 50% of search engine traffic to Wikipedia comes from Google,[141] a good portion of which is related to academic research.[142] In April 2007 the Pew Internet and American Life project found that one third of US Internet users consulted Wikipedia.[143] In October 2006, the site was estimated to have a hypothetical market value of $580 million if it ran advertisements.[144]
Wikipedia's content has also been used in academic studies, books, conferences, and court cases.[145][146][147] The Parliament of Canada's website refers to Wikipedia's article on same-sex marriage in the "related links" section of its "further reading" list for the Civil Marriage Act.[148] The encyclopedia's assertions are increasingly used as a source by organizations such as the U.S. Federal Courts and the World Intellectual Property Organization[149] - though mainly for supporting information rather than information decisive to a case.[150] Content appearing on Wikipedia has also been cited as a source and referenced in some U.S. intelligence agency reports.[151] In December 2008, the scientific journal RNA Biology launched a