Question: Baidu Baike is an encyclopedia that has more articles than the page run by the Wikimedia Foundation, which started on which date?

Context paragraphs:
Baidu 10 Mythical Creatures: The Baidu 10 Mythical Creatures (), alternatively Ten Baidu Deities, was initially a humorous hoax from the interactive encyclopedia Baidu Baike which became a popular and widespread Internet meme in the People's Republic of China in early 2009.

Wikimedia Polska: Wikimedia Polska (WMPL; Polish: "Stowarzyszenie Wikimedia Polska" ) is a Polish public benefit organization established to support volunteers in Poland who work on Wikimedia projects such as Wikipedia.  As such, it is a Wikimedia chapter approved by the Wikimedia Foundation which owns and hosts those projects.

Wikimedia movement: The Wikimedia movement, or simply Wikimedia, is the global community of contributors to Wikimedia Foundation projects.  The movement was created around Wikipedia's community, and has since expanded to the other Wikimedia projects, including the commons projects Wikimedia Commons and Wikidata, and volunteer software developers contributing to MediaWiki.  These volunteers are supported by numerous organizations around the world, including the Wikimedia Foundation, related chapters, thematic organizations, and user groups.

List of Wikipedia mobile applications: A number of organizations within the Wikimedia movement including the Wikimedia Foundation publish official Wikipedia mobile apps for using Wikipedia on multiple mobile device operating systems. All are available for free via the appropriate app store: Android (via Google Play), iOS (via App Store), Firefox OS (via Firefox Marketplace), and Windows 8 (via Windows Store).  They can also be downloaded independently of any third party store, from the Wikimedia Foundation's releases website, which also keeps old and beta versions.

Wikimedia Bangladesh: Wikimedia Bangladesh Foundation (aka Wikimedia Bangladesh or WikimediaBD) is a registered charity established to support volunteers in Bangladesh who work on Wikimedia projects such as Wikipedia.  It is a Wikimedia chapter approved by the Wikimedia Foundation which owns and hosts those projects.

Breton Wikipedia: The Breton Wikipedia (Breton: "Wikipedia e brezhoneg" ) is the Breton language version of Wikipedia, run by the Wikimedia Foundation.  It was established in June 2004; as of August 2008 it had over 20,000 articles, making it the 56th largest Wikipedia by article count.  It reached 30,000 articles milestone on October 25, 2009 ranking 51st out of 250 languages Wikipedias; as of February 2010 it had over 31,000 articles, making it the 52nd largest Wikipedia by article count and as April 2011 it had over 37,000 articles, making it the 52nd largest Wikipedia by article count.  In July 2014 the encyclopedia reached 50,000 articles, becoming the 71st largest Wikipedia by article count.

Wikinews: Wikinews is a free-content news source wiki and a project of the Wikimedia Foundation.  The site works through collaborative journalism.  Wikipedia co-founder Jimmy Wales has distinguished Wikinews from Wikipedia by saying "on Wikinews, each story is to be written as a news story as opposed to an encyclopedia article."  The neutral point of view policy espoused in Wikinews distinguishes it from other citizen journalism efforts such as Indymedia and OhmyNews.  In contrast to most projects of the Wikimedia Foundation, Wikinews allows original work under the form of original reporting and interviews.

Chinese Wikipedia: The Chinese Wikipedia () is the (Standard) Chinese language edition of Wikipedia.  It is run by the Wikimedia Foundation.  Started on 11 May 2001, the Chinese Wikipedia currently has about articles and about registered users, of which have administrative privileges.

Baidu Baike: Baidu Baike () is a Chinese-language, collaborative, web-based encyclopedia owned and produced by the Chinese search engine Baidu.  Its test version was released on 20 April 2006, and within three weeks the encyclopedia had grown to more than 90,000 articles surpassing the number in Chinese Wikipedia.  By 2008, Hudong.com had surpassed both in article count, but Baidu Baike later became number one again.  The encyclopedia censors its content in accordance with the requirements of the Chinese government.

List of Wikimedia chapters: Wikimedia chapters are national or sub-national not-for-profit organisations created to promote the interests of Wikimedia projects locally.  Chapters are legally independent of the Wikimedia Foundation, entering into a "Chapters Agreement" with the Foundation following acceptance by the Affiliations Committee (formerly known as "Chapters Committee"), and have no control over Foundation websites.  They organise regional conferences, outreach and global events such as Wikimania.  As of January 2015 there were 41 recognised Wikimedia chapters.

Supporting paragraphs: Baidu Baike Chinese Wikipedia
Answer: 11 May 2001