Michael Moore is an unrepentant liar, he distorts facts, omits those that do not support his thesis and presents false conclusions. Anyone who has ever examined his work knows this.
For that reason, this site is immensely important. The site is called Fahrenheit Fact and its purpose is stated as:
This is not an opinion blog- it is a fact one. We make sure to source every post, and will either cite or link to the source of the provided fact. It is our desire to see a well-armed populous that is ready to evaluate the film from an informed perspective.
Obviously, if the Fahrenheit Fact blog were only a Greek chorus for Moore, it wouldn't be important because you could just read Moore's own site. But Fahrenheit Fact at least endeavors to present facts, not masqueraded opinions like Moore himself does.