Anytime anyone on a forum starts spouting fascist bullshit, you aren't allowed to call him on it without someone crying "Godwin!". This is a ridiculous meme that has completely infiltrated most, if not all, of the internet. It allows fascist ideas to be promulgated everywhere, and if anyone tries to compare what is being said or done to historical fascist activities that are exact mimics of the current crap being spouted, they are immediately dismissed out of hand.
If I was a nazi, I'd LOVE this. Hell, I'd be calling "Godwin!" all the time. It desensitizes people to what is actually being said, so they allow the same fascist crap to be repeated ad nauseum on sites that should damn well know better (RPGNet Tangency is really big on this, for example). Of course, the nazi wannabes say, "I'm not a fascist! No way! I'm a socialist! We're the good guys!". And then he continues with the same fascist rhetoric that's been in use since the 1920's.
Another prime example is the recent fight on some OSR blogs where someone claims to represent all of rpg gamers, and saying games like Lamentations of the Flame Princess should not be allowed to be published because they are morally bad, thanks to some pretty nasty art scenes in the books. It's the same kind of puritanical crap that has caused so many of our freedoms to be removed on a daily basis. Don't allow this kind of rhetoric to stand unchallenged!
People, you need to wake up and confront fascism in all it's forms, and not run away afraid just because of the word Godwin.
“Fascism should more appropriately be called Corporatism because it is a merger of state and corporate power” - Benito Mussolini