(radio or television) If a network "pulled" the ad or refused to air it for whatever reason is that to be considered as censorship? (Freedom of speech, expression) where can advertisers cross the line? Who is to say that there should be a line? Why is there a line?

As much as it infringes on our rights, there has to be a line somewhere in my opinion.. otherwise.. one word, "Hitler"

Businesses cannot accept or reject any ad - it's there call as it is their business that will be affected by their decisions. They are still bound by FCC regulations of course.