Wikipedia is also dual-licensed under GFDL; media

Wikipedia
A white sphere made of large jigsaw pieces, with letters from several alphabets shown on the pieces
Wikipedia wordmark
The logo of Wikipedia, a globe featuring glyphs from several writing systems
Screenshot
Type of site
Online encyclopedia
Available in 301 languages
Owner Wikimedia Foundation
Created by Jimmy Wales, Larry Sanger1
Website wikipedia.org
Alexa rank Steady 5 (Global, October 2018)
Commercial No
Registration Optionalnotes 1
Users >306,861 active usersnotes 2 and >78,581,574 registered users
Launched January 15, 2001; 17 years ago
Current status Active
Content license
CC Attribution / Share-Alike 3.0
Most text is also dual-licensed under GFDL; media licensing varies
Written in LAMP platform2
OCLC number 52075003
Wikipedia (/?w?k??pi?di?/ (About this soundlisten), /?w?ki?pi?di?/ (About this soundlisten) WIK-ih-PEE-dee-?) is a multilingual, web-based, free encyclopedia based on a model of openly editable and viewable content, a wiki. It is the largest and most popular general reference work on the World Wide Web,345 and is one of the most popular websites by Alexa rank.6 It is owned and supported by the Wikimedia Foundation, a non-profit organization which operates on money it receives from donors.789

Wikipedia was launched on January 15, 2001, by Jimmy Wales and Larry Sanger.10 Sanger coined its name,1112 as a portmanteau of wikinotes 3 and “encyclopedia”. Initially an English-language encyclopedia, versions in other languages were quickly developed. With 5,754,417 articles,notes 4 the English Wikipedia is the largest of the more than 290 Wikipedia encyclopedias. Overall, Wikipedia comprises more than 40 million articles in 301 different languages14 and by February 2014 it had reached 18 billion page views and nearly 500 million unique visitors per month.15

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In 2005, Nature published a peer review comparing 42 science articles from Encyclopædia Britannica and Wikipedia and found that Wikipedia’s level of accuracy approached that of Britannica.16 Time magazine stated that the open-door policy of allowing anyone to edit had made Wikipedia the biggest and possibly the best encyclopedia in the world, and was a testament to the vision of Jimmy Wales.17

Wikipedia has been criticized for exhibiting systemic bias, for presenting a mixture of “truths, half truths, and some falsehoods”,18 and for being subject to manipulation and spin in controversial topics.19 In 2017, Facebook announced that it would help readers detect fake news by suitable links to Wikipedia articles. YouTube announced a similar plan in 2018. In response, The Washington Post headlined, “Wikipedia, the ‘good cop’ of the Internet”.20

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