even when they're abbreviated
I think that's right. Plenty of electronic communication is rotten and subliterate, but such has always been the way. The good news is that people who would never have put pen to paper in the days of hard copy, and who never owned a typewriter, now spend hours every day trying to communicate through the written word.
Beginners are rarely eloquent, and many have a long way to go before they write powerful or graceful prose. But I can only rejoice to see so many people getting practical experience in writing. Rather than lamenting the disappearance of the good old days, I'd like to see those concerned about young people's writing try to take advantage of students' passion for putting things in words, even when they're abbreviated and misspelled.
Here's a link to Jack's entry in full.