Wikipedia quickly became the largest reference website, with thousands of people contributing worldwide. In December 2004, Wikipedia had 1.3 million articles by 13,000 contributors in 100 languages. In December 2006, Wikipedia was among the top ten sites on the web, with 6 million articles. In May 2007, Wikipedia had 7 million articles in 192 languages, including 1.8 million articles in English, 589,000 articles in German, 500,000 articles in French, 260,000 articles in Portuguese, and 236,000 articles in Spanish. In 2008, Wikipedia was in the top five websites. In September 2010, Wikipedia had 14 million articles in 272 languages, including 3.4 million articles in English, 1.1 million articles in German and 1 million articles in French. Wikipedia celebrated its tenth anniversary in January 2011 with 17 million articles in 270 languages et 400 million individual visits per month for all websites. Wikipedia also inspired many other projects over the years, for example Citizendium, launched in 2007 as a pilot project to build a new encyclopedia. Citizendium, an acronym for “The Citizen’s Compendium”, was launched in March 2007 at the initiative of Larry Sanger, who co-founded Wikipedia with Jimmy Wales in January 2001, but resigned later on over policy and content quality issues, as well as the use of anonymous pseudonyms. Citizendium is a wiki project open to public collaboration, but combining "public participation with gentle expert guidance". The project is experts-led, not experts-only. Contributors use their own names, and they are guided by expert editors. As explained by Larry in his essay "Toward a New Compendium of Knowledge", posted in September 2006 and updated in March 2007: "Editors will be able to make content decisions in their areas of specialization, but otherwise working shoulder-to-shoulder with ordinary authors." There are also constables who make sure the rules are respected. There were 1,100 high-quality articles, 820 authors, and 180 editors in March 2007, 11,800 articles in August 2009, and 15,000 articles in September 2010. Citizendium wants to act as a prototype for upcoming large scale knowledge-building projects that would deliver reliable reference, scholarly and educational content. 2001 > THE CREATIVE COMMONS LICENSE