Wikipedia.org from Best Homepages

Wikipedia was launched on January 15, 2001, by Jimmy Wales and Larry Sanger. Sanger coined its name, a portmanteau of wiki and encyclopedia. There was only the English-language version initially, but it quickly developed similar versions in other languages, which differ in content and in editing practices. With 5,447,523 articles, the English Wikipedia is the largest of the more than 290 Wikipedia encyclopedias. Overall, Wikipedia consists of more than 40 million articles in more than 250 different languages and, as of February 2014, it had 18 billion page views and nearly 500 million unique visitors each month.