There is something about the directness of twitter thats more like a conversation and sparks an instant response where in an email you would have to sit down and think of a structured reply (if you bothered to do that of course). Also fun to see people from all over add little comments etc. Yes, I think we are all Twitter converts, but you still need a meaningful network of people for it to make sense, and getting that together is not always going to be easy / or obvious to people not on twitter.
Don’t know what was said at your creativity course, but I guess there are lots of types of creativity. Definately not only for a select band of special people, I’m sure all are capable, although perhaps some people are more inclined towards lateral thinking than others. had better go now!!!!