Since I am no longer teaching, I can't really weigh in on this debate, but I can say that it seems to make sense in a purely logical way. I wonder whether these results are seen by you teachers of composition and writing out there. Are your current students more persuasive, more prolific, than classes of the past? Do they write better when they write for a specific audience? Does all that constant blogging, tweeting, and facebooking actually improve their compositional skills? Please share your experiences and your thoughts.