In real life, I rarely (personally) see that line crossed but the news and the internet are always full scribbled and erased lines, however, I think that the line changes depending on the situation, so I suppose that falls into the category of "not very defined", wouldn't you agree?
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I would tend to agree, I say it is like the Supreme Court ruled when they were asked about vulgar language and indecency....they know it when they see it, right?