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I work with 6-12s in a K-12 school every day.
What students suck at is pure and simple email etiquette, and NOT because of their command of chatspeak. And that's no surprise because, IMO, our curriculum doesn't teach *email* writing, even if it does *letter* writing. And most students aren't smart enough to transfer *letter* writing skills to *email*. Most schools, I imagine, also don't teach things like the lack of emotional transfer on paper/electronic vs. talking.