Www.wikipedia.org screenshot 2013.png

Wikipedia bula encyclopedia nola na Internet. Dika Nupedia, Jimmy Wales bula otu madu bidoro ya, ha na Larry Sanger. Na 15 Jenụwarị, na afo 2001, ha hapuru Wikipedia bido Nupedia, nwere he nile nola n'ebee tinye na Nupedia nke ndi bekee.[1]

Wikipedia kpochiri uzo ya na Septemba 2003.

Wikipedia (IPA: /ˌwikiˈpiːdi.ə/ or /ˌwɪkiˈpiːdi.ə/ (Audio (U.S.) )) is a multilingual, web-based, free content encyclopedia project. Wikipedia is written collaboratively by volunteers; its articles can be edited by anyone with access to the web site. The name is a portmanteau of the words wiki (a type of collaborative website) and encyclopedia. Its primary servers are in Tampa, Florida, with additional servers in Amsterdam and Seoul.

Wikipedia was launched as the English Wikipedia on 15 Jenụwarị 2001, as a complement to Nupedia, an expert-written and now defunct encyclopedia. The project is now operated by the Wikimedia Foundation, a non-profit organization created by Jimmy Wales who is the co-founder of Wikipedia.[2][3][4][5][6] Wikipedia has over six million articles in 250 languages,[7] including more than 1.6 million in the English edition. It has steadily risen in popularity since its inception.[8] and currently ranks among the eleven most-visited websites worldwide.[9]

Ndi na ekweghi ekwe ajụọla ajụjụ nke gbasara eziokwu nke ederede.[10] The site has also been criticized for its susceptibility to vandalism,[11] uneven quality, systemic bias and inconsistencies,[12] and for favoring consensus over credentials in its editorial process.[13] Wikipedia's content policies[14] and sub-projects set up by contributors seek to address these concerns.[15] Two scholarly studies have concluded that vandalism is generally short-lived[16] and that Wikipedia is roughly as accurate as other encyclopedias.[17]

Ihe dị ime


Editorial processEdit

Editors keep track of changes to articles by checking the difference between two revisions of a page - known as "diffs"; changes between two versions are shown in red.

Authors may edit anonymously; in such cases, their IP address is recorded as the author name.[18] Past edits to Wikipedia articles are retained, and remain viewable through "edit history" pages sorted chronologically, making it possible to see former versions of any page at any time.

Changes to Wikipedia are made available immediately on the Web, without formal peer review. Wikipedia's philosophy is that unmoderated collaboration among well-meaning, informed editors will gradually improve the encyclopedia in its breadth, depth and accuracy, and that, given enough time, the truth will win out and even subtle errors will be caught and corrected.[19] Thus, Wikipedia allows almost anyone to edit, except for users banned for persistent malfeasance after a lengthy arbitration process. Similarly, almost every article can be edited; editing is sometimes temporarily disabled for a small number of articles due to persistent vandalism or unresolved disputes among contributors. Wikipedia has not declared any of its articles "complete" or "finished".

As a general encyclopedia, Wikipedia seeks to describe as wide a range of topics as possible. It covers the subjects customarily found in traditional encyclopedias, as well as many cultural and technical topics often absent from such works or confined to subject-specialized references. In addition to the roughly exponential growth in number of articles, the average length of each article has increased steadily,[20] as has the number of "featured articles" recognized for their high quality.[20] However, significant gaps in the project's coverage remain, and many articles are not well-referenced in a manner consistent with Wikipedia's editorial policy.[21]

One notable strength of Wikipedia is its timeliness. Traditionally, new editions of encyclopedias were released every few decades, as their information became noticeably obsolete. The idea of continuous revision, in which the entire encyclopedia revised and reprinted every few years, replaced this and is now employed by most encyclopedias.[22] Wikipedia takes continuous revision to its ultimate limit — almost all articles may undergo revision at any time, allowing the project to incorporate current events. For example, the article on the 2004 Indian Ocean earthquake in the English-language edition was cited frequently by the press in the days following the event.[23]

Policies and guidelinesEdit

Decisions on the content and editorial processes of Wikipedia are made largely through consensus decision-making and, occasionally, by voting; Jimmy Wales and the Wikimedia Foundation retain final judgement.[24] Wikipedia has several policies and guidelines, also developed through consensus, that guide activity on the project, covering behavioural, content-related and legal issues.[14] One of the most important states that articles must be written from a "neutral point of view",[25] presenting all noteworthy perspectives on an issue along with the evidence supporting them — thus, rather than aspiring to determine the objective truth of their subjects, articles attempt to describe them impartially from all significant viewpoints. Individual edits that contain libelous statements, copyright violations, and other content that could incur legal liability or be otherwise detrimental to Wikipedia are permanently hidden from view using a process called "Oversight".[26]

Free content and licensingEdit

Contributions to Wikipedia are covered by the GNU Free Documentation License (GFDL), one of the many copyleft licenses that permit the redistribution, creation of derivative works, and commercial use of content. This license allows Wikipedia's editors to retain copyright of their work, but allows others to build upon that work and republish it, as long as the original author is credited and the derivative work is likewise covered by the GFDL. This license ensures that Wikipedia can be edited freely; each author's contributions are recorded for posterity in a database. Larry Sanger has said that having the GFDL as a "guarantee of freedom is a strong motivation to work on a free encyclopedia".[27]

Wikipedia also contains images and other media that were not created by its editors, but are in the public domain. Other content on Wikipedia is released under different copyleft terms or licenses compatible with the GFDL, such as Creative Commons licenses. Still other items such as corporate logos, song samples, or copyrighted news photos are presented with a claim of fair use under the United States copyright law. The Wikimedia Commons, a media repository and sister project in which many of Wikipedia's images are stored, also allows other copyleft licenses, but does not accept fair use images.[28] Contributors may choose to multi-license their contributions under both the GFDL and the public domain, or the GFDL and other licenses, allowing third parties to use the content under any of these licenses.[29]

Wikipedia's open license fosters other innovative uses and presentations of its content. A spoken version is available for some articles in the Ogg Vorbis format,[30] as the more widely used MP3 format is covered by software patents which encumber redistribution under a free license.[31] Stand-alone versions of Wikipedia such as Lexipedia are available for handheld devices. SOS Children distributes the encyclopedia on a CD (2006 Wikipedia CD Selection). Published copies of selected Wikipedia articles are also available via PediaPress, a print on demand service.[32] A project within Wikipedia is working on "Wikipedia 1.0", a collection of Wikipedia articles that have been verified for accuracy and are ready for printing or burning to CDs. The German Wikipedia has been distributed on DVD; print and digital versions of the English edition are being planned.[33]


Wikipedia originally developed from another encyclopedia project, Nupedia.

Wikipedia began as a complementary project for Nupedia, a free online encyclopedia project whose articles were written by experts and reviewed by a formal process. Nupedia was founded on 9 Eprel 2008, under the ownership of Bomis, Inc, a web portal company. Its principal 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 GFDL before Wikipedia's founding at the urging of Richard Stallman.[34]

On 29 Jenụwarị 2005, Larry Sanger proposed on the Nupedia mailing list to create a wiki as a "feeder" project for Nupedia.[35] Wikipedia was formally launched on 15 Jenụwarị 2001, as a single English-language edition at http://www.wikipedia.com/, and announced by Sanger on the Nupedia mailing list.[36] Wikipedia's policy of "neutral point-of-view"[25] 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.[37] Wikipedia gained early contributors from Nupedia, Slashdot postings, and search engine indexing. It grew to approximately 20,000 articles, and 18 language editions, by the end of 2001. It grew to 26 language editions by the end of 2002, 46 by the end of 2003, and 161 by the end of 2004.[38] Nupedia and Wikipedia coexisted until the former's servers went down, permanently, in 2003, and its text was incorporated into Wikipedia. Larry Sanger and Jimmy Wales are both the co-founders of Wikipedia.[2][6]

Wikipedia's English edition on 30 Maachị 2001, two and a half months after its founding.

Wales and Sanger attribute the concept of using a wiki to Ward Cunningham's WikiWikiWeb or Portland Pattern Repository.Àtụ:Citation needed Although Wales is credited with defining the goal of making a publicly-editable encyclopedia,[37] Sanger is usually credited with the strategy of using a wiki to reach that goal.[39]

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 Febrụwarị 2002. Later that year, Wales announced that Wikipedia would not display advertisements, and its website was moved to wikipedia.org. Various other projects have since forked from Wikipedia for editorial reasons. Wikinfo does not require neutral point of view and allows original research. New Wikipedia-inspired projects — such as Citizendium, Scholarpedia and Amapedia — have been started to address perceived limitations of Wikipedia, such as its policies on peer review, original research and commercial advertising.

The Wikimedia Foundation was created from Wikipedia and Nupedia on 20 Juun 2003.[40]

The Wikimedia Foundation applied to the United States Patent and Trademark Office to trademark Wikipedia® on 17 Septemba 2004. The mark was granted registration status on 10 Jenụwarị 2006. Trademark protection was accorded by Japan on 16 Disemba 2004 and in the European Union on 20 Jenụwarị 2005. Technically a service mark, the scope of the mark is for: "Provision of information in the field of general encyclopedic knowledge via the Internet". There are plans to license the usage of the Wikipedia trademark for some products, such as books or DVDs.[41]

The number of English Wikipedia articles grew exponentially from 2002 to 2006, with a doubling time of roughly 1 year.[42]

As of 2007, English Wikipedia had over 1.6 million articles, making it the largest encyclopedia ever assembled, eclipsing even the Yongle Encyclopedia (1407), which held the record for nearly 600 years.[43]

Authorship and managementEdit

During Disemba 2005, about 27,000 users made at least five edits to Wikipedia; of these, 17,000 worked on the English edition.[44] Maintenance tasks are performed by a group of volunteers; these include developers, who work on the MediaWiki software, and other trusted users with various permission levels including "steward", "bureaucrat" and "administrator".[45] Stewards and bureaucrats are able to promote or demote users to different permission levels. Administrators are the largest group of specially privileged users, and have the ability to delete pages, prevent articles from being edited, or block users from editing. Administrators are, however, required to follow community policy when exercising these powers.[46] These permissions are normally granted by community consensus; stewards are elected at irregular intervals. Vandalism or the minor infraction of policies may result in a warning or temporary block, while long-term or permanent blocks for prolonged and serious infractions are given by<citation need> (or in the name of) Jimmy Wales or, on the English-language edition, an elected "Arbitration Committee".[47]

Wikipedia is funded through the Wikimedia Foundation. Its 4th Quarter 2005 costs were $321,000 USD, with hardware making up almost 60% of the budget.[48] The Wikimedia Foundation currently relies primarily on private donations, and holds regular fundraisers;[49] the Jenụwarị 2007 fundraiser raised just over $1 million.[50]

Software and hardwareEdit

Wikipedia receives between 10,000 and 30,000 page requests per second, depending on time of day.[51] More than 100 servers have been set up to handle the traffic.

The operation of Wikipedia depends on MediaWiki, a custom-made, open source wiki software platform written in PHP and built upon the MySQL database. The software incorporates modern 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 brackets were incorporated later. Starting in Jenụwarị 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 Julaị 2002 (Phase III), Wikipedia shifted to the third-generation software, MediaWiki, originally written by Lee Daniel Crocker.

Overview of system architecture, Mee 2006. Source: Server layout diagrams on Meta-Wiki.

Wikipedia runs on dedicated clusters of Linux servers in Florida and in four other locations.[52] Wikipedia employed a single server until 2004, when the server setup was expanded into a distributed multitier architecture. In Jenụwarị 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. By Septemba 2005, its server cluster had grown to around 100 servers in four locations around the world.

Page requests are first passed to a front-end layer of Squid caching servers. Requests that cannot be served from the Squid cache are sent to load-balancing servers running the Perlbal 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 for anonymous users are cached in a filesystem until invalidated, allowing page rendering to be skipped entirely for most common page accesses. To further accelerate response times, Wikimedia is building a global network of caching servers, beginning with three caching servers in France. Two larger clusters in the Netherlands and Korea now handle much of Wikipedia's traffic load.

Language editionsEdit

Wikipedia in Hebrew.[53]

Wikipedia has been described 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".[54] There are presently 250 language editions of Wikipedia; of these, the top 14 have over 100,000 articles and the top 131 have over 1,000 articles.[7] According to Alexa Internet's audience measurement service, the English subdomain (en.wikipedia.org) receives approximately 55% of Wikipedia's cumulative traffic, with the remaining 45% split among the other languages.[8] The various language editions are held to global policies such as "neutral point of view," though they may diverge on subtler points of policy and practice.

The editing of the language editions is not coordinated, and articles of one edition need not match their counterparts in another edition. Multilingual editors of sufficient fluency are encouraged to manually translate articles; automated translation of articles is explicitly disallowed.[55] Translated articles represent only a small portion of articles in most editions.[56] Articles available in more than one language offer "InterWiki" links in their left margins, which link to the counterpart articles in other editions. Images and other non-verbal media are shared among the various language editions through the Wikimedia Commons repository.

Editions of Wikipedia with over 100,000 articles
English en: - German de: - French fr: - Polish pl: - Japanese ja: - Dutch nl: - Italian it: - Portuguese pt: - Swedish sv: - Spanish es: - Russian ru: - Chinese zh: - Finnish fi: - Norwegian (Bokmål) no:

Reliability and biasEdit

Wikipedia appeals to the authority of peer-reviewed publications rather than the personal authority of experts.[57] Wikipedia does not require that its contributors give their legal names[58] or provide other information to establish their identity.[59] Although some contributors are authorities in their field, Wikipedia requires that even their contributions be supported by published sources.[57] A drawback of this citation-only approach is that readers may be unable to judge the credibility of a cited source.

Wikipedia tries to address the problem of systemic bias, and to deal with zealous editors who seek to influence the presentation of an article in a biased way, by insisting on a neutral point of view.[25] The English-language Wikipedia has introduced a scale against which the quality of articles is judged;[60] other editions have also adopted this. Roughly 1200 have passed a rigorous set of criteria to reach the highest rank, "featured article" status; such articles are intended to provide a thorough, well-written coverage of their topic, and be supported by many references to peer-reviewed publications.[61]

Academic evaluationEdit

Studies suggest that Wikipedia provides a good starting point for research, but sometimes suffers from significant omissions and inaccuracies.[62] But an investigation by Nature comparing Wikipedia to the Encyclopædia Britannica suggested a near similar level of accuracy in terms of its natural science articles;[63] however, Encyclopædia Britannica, Inc., described this study as "fatally flawed",[64] to which Nature later responded, stating that its study was perfectly neutral.[65] Other studies have concluded that Wikipedia's coverage of history is significantly broader and deeper than that of Encarta, while being just as accurate,[17] and that obvious vandalism is usually reverted quickly.[16] In a study of Wikipedia as a community, economics PhD 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.[66] Wikipedia has been viewed as a social experiment; founder Jimmy Wales has stated that it is not intended as one, though that is a consequence.[67]

Criticism and controversyEdit

Wikipedia has been accused of exhibiting systemic bias and inconsistency;[10] critics argue that Wikipedia's open nature, and favouring consensus over credentials in its editorial process, makes it unauthoritative, and that a lack of proper sources for much of the information makes it unreliable,[68] although the converse of the same argument can also be argued. Some commentators suggest that Wikipedia is usually reliable, but that it is not always clear how much.[13] The project's preference for consensus over credentials has been labelled "anti-elitism".[12] Editors of traditional reference works such as the Encyclopædia Britannica have questioned the project's utility and status as an encyclopedia.[69] Many university lecturers discourage students from citing any encyclopedia in academic work, preferring primary sources;[70] some specifically prohibit Wikipedia citations.[71] Founder Jimmy Wales stresses that encyclopedias of any type are not usually appropriate as primary sources, and should not be relied upon as authoritative.[72] Technology writer Bill Thompson commented that the debate was possibly "symptomatic of much learning about information which is happening in society today."[73]

Concerns have also been raised regarding the lack of accountability that results from users' anonymity,[74] and that it is vulnerable to vandalism and Internet trolls.[75] For example, false information was introduced into the biography of John Seigenthaler, Sr. and remained undetected for four months.[76]

Wikipedia's community has been described as "cult-like",[77] although not always with entirely negative connotations,[78] and criticised for failing to accommodate inexperienced users.[79] The addition of political spin to articles by organizations including the U.S. House of Representatives and special interest groups[11] has been noted,[80] and organizations such as Microsoft have offered financial incentives to work on certain articles.[81] Wikipedia has been parodied by its critics, notably by Stephen Colbert in The Colbert Report.[82]

In 2007 the Wikipedia article on then-Montana senator Conrad Burns was edited by his own staff, causing political scandal among his own constituents.[83]

Wikipedia's content policies[14] and sub-projects set up by contributors seek to address these concerns.[84] Several scholarly studies have concluded that vandalism is generally short-lived,[16] and that Wikipedia is roughly as accurate as other online encyclopedias.[17]


Wikipedia won two major awards in Mee 2004.[85] The first was a Golden Nica for Digital Communities of the annual Prix Ars Electronica contest; this came with a €10,000 (£6,588; $12,700) grant and an invitation to present at the PAE Cyberarts Festival in Austria later that year. The second was a Judges' Webby Award for the "community" category.[86] Wikipedia was also nominated for a "Best Practices" Webby. In Septemba 2004, the Japanese Wikipedia was awarded a Web Creation Award from the Japan Advertisers Association. This award, normally given to individuals for great contributions to the Web in Japanese, was accepted by a long-standing contributor on behalf of the project.

In a 2006 Multiscope research study, the Dutch Wikipedia was rated the third best Dutch language site, after Google and Gmail, with a score of 8.1.[87] On 26 Jenụwarị 2007, Wikipedia was also awarded the fourth highest brand ranking by the readers of brandchannel.com, receiving 15% of the votes in answer to the question "Which brand had the most impact on our lives in 2006?"[88] Founder Jimmy Wales was named one of the 100 most influential people in the world by TIME Magazine in 2006.[89] In 2006, the Russian Wikipedia won the "Science and education" category of the "Runet Prize" (Russian: Премия Рунета) award, supervised[90] by the Russian government agency FAPMC.

In the mediaEdit

Wikipedia's content has been mirrored and forked by hundreds of sites including database dumps. Its content has also been used in academic studies, books and conferences.[91] and used in court cases.[92] The Canadian Parliament website refers to Wikipedia's article on same-sex marriage in the "related links" section of its "further reading" list for Civil Marriage Act.[93] The encyclopedia's assertions are increasingly used as a source by organizations such as the U.S. Federal Courts and the World Intellectual Property Office[94] — though mainly for supporting information rather than information decisive to a case.[95] Wikipedia has also been used as a source in journalism,[96] sometimes without attribution; several reporters have been dismissed for plagiarizing from Wikipedia.[97][98]

Wikipedia maintains a (non-comprehensive) list of notable uses of the encyclopedia as a source.[99]

With increased usage and awareness, there have been an increasing number of references to Wikipedia in popular culture. Many parody Wikipedia's openness, with characters vandalizing or modifying the online encyclopedia project's articles. Uncyclopedia is the largest such website; its Main Page claims that it is the "content-free encyclopedia that anyone can edit,"[100] parodying the English Wikipedia's welcome message on its Àtụ:Srlink.

In the episode "Wikiality" of The Colbert Report, host Stephen Colbert has instigated his viewers to vandalize articles in humorous ways, once doing so on the Wikipedia article on elephants.[101] "Weird Al" Yankovic's character in his video 'White & Nerdy' is seen vandalising the entry for the Atlantic record label with the exclamation "You suck!," after they rescinded permission for a parody.[102]

In a recent episode of American Dad (entitled Black Mystery Month), protagonists Stan Smith and Steve Smith fail to reveal to the world that George Washington Carver wasn't the person who invented peanut butter, then create a Wikipedia page entitled "The Truth About Peanut Butter" to inform the world, citing that it is the one place you can put crazy information out with no evidence and still have millions of people believe it to be true.

Related projectsEdit

Wikipedia has spawned several sister projects. The first, "In Memoriam: 11 Septemba Wiki",[103] created in Ọktoba 2002,[104] detailed the 11 Septemba 2001 attacks; this project was closed in Ọktoba 2006.[105] Wiktionary, a dictionary project, was launched in Disemba 2002;[106] Wikiquote, a collection of quotations, a week after Wikimedia launched, and Wikibooks, a collection of collaboratively-written free books, the next month. Wikimedia has since started a number of other projects.[107]

A similar non-wiki project, the GNUpedia project, co-existed with Nupedia early in its history; however, it has been retired and its creator, free-software figure Richard Stallman, has lent his support to Wikipedia.[34]

Other websites centered around collaborative knowledge base development have drawn inspiration from or inspired Wikipedia. Some, such as Susning.nu, Enciclopedia Libre, and WikiZnanie likewise employ no formal review process, whereas others use more traditional peer review, such as the expert-written Stanford Encyclopedia of Philosophy, h2g2 and Everything2.

See alsoEdit


  1. Kaplan Andreas, Haenlein Michael (2014) Collaborative projects (social media application): About Wikipedia, the free encyclopedia. Business Horizons, Volume 57 Issue 5, pp.617-626
  2. 2.0 2.1 Cite error: Invalid <ref> tag; no text was provided for refs named foundercontroversy
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  8. 8.0 8.1 Five-year traffic statistics for wikipedia.org. Alexa Internet. Retrieved on 2007-01-29.
  9. Three-month traffic statistics for wikipedia.org. Alexa Internet. Retrieved on 2007-01-29.
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  12. 12.0 12.1 Larry Sanger, "Why Wikipedia Must Jettison Its Anti-Elitism", Kuro5hin, 31 Disemba 2004.
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