Classroom Twitter as an Exit Card

Through Pinterest, I found this idea for using Twitter as an exit card to have kids reflect on the lesson that day or a project for that week. I’m not sure how one would use it in a middle school classroom with 160 kids, but I like the idea of having exit cards be visible to everyone, not just something that each student writers to the teacher. (From Will put this one in the hopper and think on it for awhile.