Community-building is the most powerful thing for me about digital means. I think having an assignment that requires collaborative work really helps the students. If they start online exchanging bits of texts, they wind up offline meeting and talking in rooms, eating pizza, and arguing with each other ferociously. They share the task of drafting answers to questions and they form these small community groups inside the class that then continue to function through the whole of the term. It totally changes the dynamics of a big lecture class because you suddenly have groups of as many as 20 who feel like they know each other. They've shared the experience of really trying to hash out the material.