Interesting contrast between the attitudes of China and the U.S to Twitter at the moment.
In China, access has been stopped to Twitter (and new Microsoft search engine Bing). The likely reason is the anniversay of Tiananmen Square protest. However, like a lot of people analysing usage figures for Twitter, the Chinese authorities seem to have forgotten about Twitter clients, such as Seesmic Desktop, for the moment.
Compare that to the U.S – with the military unveiling a social media strategy for news from Afghanistan which includes Facebook, Youtube and Twitter. There’s an official Twitter account at www.twitter.com/usfora which currently has 2985 followers. There’s some more detail in a Wired article.