Wikipedia

Wikipedia was created by Jimmy Wales and Larry Sanger. Wikipedia uses the open editing model called "wiki". Except for a few vandalized pages that can be edited only by established users, or in extreme cases only by administrators, every article may be edited anonymously or with a user account, while only registered users may create an article. No article is owned by its creator or any other editor, or is vetted by any recognized authority; rather, the articles are collectively owned by a community of editors. Wikipedia started 8 years ago, January 15, 2001.