Twitter blocked in China

In terms of new media, do you still feel that in China censors could control everything that's happening in this area - you once said that if they shut off twitter, for example, it would be very easy, and information will just not get out.

The block seems to be a URL keyword filter. Googling for "twitter.com" resets the connection, as does including the string "twitter.com" in any other URL. Access to the service is fine through proxy or VPN.