If you are debating, curse words and such are only used to make up for your lack of debating talent. The only other time I can think of where someone would use curse words (besides insulting people, of course, but that is another thing entirely) is if you rant to let off your feelings. And isn't there LiveJournal for that?

Oh, and I guess you might post curse words if you post Rap lyrics. But I have a personal vendetta with rap, so that is perfectally fine in my eyes. Anyway, who really needs to post lyrics? Chances are, the people who would like the lyrics have already heard the song.