It’s a little late, but I focus on Twitter which is called a micro blog. I think, it is from not chat but blog that is similar to web diary to show his or her daily life to Internet. Because it is emphasize opening to public rather than sharing with neighbors. It is the result of the quest for instancy and conveniency.
I don’t argue that it is good or not good, but it is clear truth that Twitter got a citizenship. According to this fact, I feel that smallness has more power than usual with the advent of Internet. Nowadays cloud computer is substantializing. It means, super computer and big cabinet will become outdated.