Social networking sites are under increasing pressure in
Twitter and Facebook have been inaccessible for a while; next to go dark was Fanfou, a Chinese service offering microblogging services like Twitter's, which became unavailable in China shortly after this month's unrest in Xinjiang, according to international news reports. The Associated Press said that Digu and Zuosa, also microblogging platforms, closed on Tuesday, citing maintenance needs.
Online security was tight across the board today, AP reported. The technology news sites of two popular Internet portals, Sina and Netease, were also down for several hours after posting stories on a corruption probe into a company formerly overseen by President Hu Jintao's son. The Berkeley, California-based China Digital Times has posted a censorship notice the Central Propaganda Department apparently sent to all online news providers regarding the subject.
With government censors as keen as ever, it might seem
inevitable that the upstart microblogging community--the format went mainstream
in

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It's totally unbelievable. There are 340 million Internet users in China and they manage to control their activity...
There should be methods to overcome The Great Chinese Firewall...
It is unbelievable, but the Chinese authorities will lose this battle - unless of course they block all internet access.
The internet is a vastly more powerful communication medium than anything in human history, it is too far reaching and adaptable to be controlled by any nation.
There are many methods to bypass the chinese firewall and believe me many chinese are one step ahead of their government :)