I began Twitter. Is it too late? Twitter may be useful as "asynchronous" IM for the time different.
BTW, I was surprised at a certain feature of Twitter when I signed up. Twitter can search my web mail box and find friends who have begun Twitter already. Because I use gmail as my web mail, I entered my gmail address and its password. And Twitter found tadashi and Tom_G3X.
I hope that Twitter doesn't stole my important information from my mail box. :)