If I'm going to say something sarcastic, I do so in comedic fashion, no matter how funny, or not, my statement is. I don't want to have to defend a position I don't have, therefore, I use coloured font, green, orange, whatever.
The downside of text only is you don't get the benifit of inflection, which for most people is the easiest way to catch sarcasm.
And now... back to the original thread.
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