Chat

cPros:
- multiple people can be typing at the same time, which actually increases the amount of participation you can have, especially from people for whom conversational wait time is a bigger problem.

Cons:
- thoughts sometimes get shared out of order. (Then again, that sometimes causes them not to be shared at all when face-to-face--I'm thinking of faculty meetings where you don't end up making your point because the conversation has already moved on past it.)