Wikipedia is one of the best internet sources for free information. It was created by Jimmy Wales and Larry Sanger in January 2001. The website was a spoof to Unclopedia "the free content enclopedia" while Wikipedia was "the free enclopedia". Wikipedia is number 5 in the Alexa Ranks and its information is almost as exact as Enclopaedia Briticanna.
Wikipedia did had it fair share of controversy. Such as that it can be edited by anyone and articles might have false information. A famous case was with John Seigenthaler, who's article was vandalised with malicious information of him being a suspect for the assasination of American president John F. Kennedy.