The website www.wikimeg.com launched Monday.
The homepage says it's trying to counter the former eBay CEO's hundreds of millions of dollars, spent on advertising.
Visitors have to provide an email address to post. They're encouraged to provide eBay stories, Whitman history and sightings.
One entry says she charged eBay more than $3 million for use of a corporate jet.
Analysts warn to beware of misinformation on the site.