Twitter tells other people what you are doing – in 140 characters or less – in the moment in which you are doing it. Quite Zen really.
I’m not sure about its value. It seems to do far less than other social networking tools; a case where less isn’t necessarily more. Maybe it’s more about harnessing Surowiecki’s wisdom of the crowd – or O’Reilly’s ethos of the more you use it the better it gets; the ‘harvesting of collective intelligence’. But even if I used it more, with a greater number of people, I’m still not convinced I would find any intrinsic value.