Wikipedia Will Screen Changes on Articles About Living People - 2009-08-25
Wikipedia has already locked out individuals and entities - notably, the Church of Scientology, which got the boot in May for repeated and deceptive editing of articles related to the controversial religion. Wired.com readers also pulled in an award for discovering the most egregious Wikipedia whitewashes by corporation and government agencies.
But now, if you want to sow the seeds of doubt about President Obama's country of birth, don't bother to edit his Wikipedia entry. It'll never see the light of day.