I would put it this way: his theory would predict that 140-character twitter would result in a different culture and thought process than Livejournal, and both

I would put it this way: his theory would predict that 140-character twitter would result in a different culture and thought process than Livejournal, and both would be different from Tiktok, which would in turn be different than Twitch - all entirely due to the constraints on the medium. that is a useful theory. (do I think he probably took too much LSD and got high on his own theories? yes. but its at least adequate as a predictive starting point - and what more can we ask of any model?)