I like the fact that this makes a clear push to get Twitter and networking in front of teachers who may not have a PLN or any networking experience. I wonder if teachers would feel like it's an intrusion into a "downtime" space? I also wonder if there's a way to have teachers send interesting articles to themselves to read later. Could there be an interface component which lets teachers e-mail an interesting article to themselves? Finally, I see the value of a big screen drawing attention, but that's harder to read. The flipside might be to have it running on a couple of tablets in the center of common tables?