Wales , and other members of the Wikipedia user community , founded Wikipedia 's first " sister site , " " In Memoriam : September 11 Wiki , " in October 2002 ; it detailed the September 11 attacks . ( This project was closed in October 2006 . ) A second sister site , Wiktionary , was created in December 2002 ; the site was meant to be a collaboratively created dictionary
September 11 attacks
September 11 attacks
History of wikis