For what it's worth, the Wikipedia has a policy on fringe theories. Here's the opening paragraphs:
Wikipedia summarizes significant opinions, with representation in proportion to their prominence. A Wikipedia article should not make a fringe theory appear more notable than it is. Claims must be based upon independent reliable sources. A theory that is not broadly supported by scholarship in its field must not be given undue weight in an article about a mainstream idea, and reliable sources must be cited that affirm the relationship of the marginal idea to the mainstream idea in a serious and substantial manner.There are numerous reasons for this. Wikipedia is not and must not become the validating source for non-significant subjects. Wikipedia is not a forum for original research. And for writers and editors of Wikipedia articles to write about controversial ideas in a neutral manner, it is of vital importance that they simply restate what is said by independent secondary sources of reasonable reliability and quality.