|Godwin’s Law was formulated by Mike Godwin in the 1990s and states:
As an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches one. Godwin’s Law does not dispute the validity or otherwise of references or comparison to Hitler or the Nazis. As such a comparison or reference may sometimes be appropriate in a discussion, Godwin has argued that overuse of the Nazi comparison should be avoided as it waters down the impact of any valid usage.
With the increase in the number of media for online discussion, Godwin's law is now applied to any online discussion - be they mailing lists, message boards, forums, chat rooms, blog comment threads, or wiki talk pages.
Traditionally in many Internet discussion forums, it is the rule that once such a comparison is made, the discussion is effectively finished and whoever mentioned Hitler or the Nazis has automatically lost the debate.