ClassDojo user, you probably received the same email I did this morning in which they shared the ClassDojo Idea Board. In case you missed it, the ClassDojo Idea Board small site featuring 25 ways to use ClassDojo. The Idea Board has four sections; getting started, connect parents, engage students, and tips. Many of the items on the Idea Board have been featured in other ClassDojo promotions, but now they're consolidated into one place.
I think the best use of ClassDojo is to promote and recognize the good things that students do. That idea is featured in the video embedded below.