All of the companies making consumer-oriented wikis are privately held and do not release revenue figures. But so far, not one of them has come close to the popularity of Wikipedia.
By Robert Levine Every day millions of people find answers on Wikipedia, to questions both trivial and serious. Jack Herrick found his business model there. In 2004, Herrick acquired the how-to guide eHow.com, which featured original articles written by paid freelance writers.