Today Wikipedia, the online encyclopedia, is 10 years old. Co-founder Jimmy Wales made the first ever Wikipedia edit on January 15, 2001, when he typed 'Hello, World!' on the front page.
Since its creation in 2001, Wikipedia has grown rapidly into one of the largest reference websites, attracting nearly 78 million unique visitors a month as of January 2010. There are more than 91,000 active contributors working on more than 17,000,000 articles in more than 270 languages. As of today, there are 3,529,170 articles in English.