Do you ever swear when you write?

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I had read posts where the author curse and swear as he/she writes them. Maybe it is due to anger and frustration that one could not resist inside the heart, blaring them in words to feel better. As for me, I do not write any cursing or swearing words, whether in initials or short abbreviations. It is impolite and down grading oneself to write such words. I am sure that most online writing sites do not allow such nonsense. However if you read comments in Facebook and forum sites, you will notice lots of swear words prompt in almost every comment! Do you swear when you write, when you are angry?