Chinese web filtering 'erratic'
 

*Source: _BBC News_ (http://news.bbc.co.uk/2/hi/technology/6990842.stm)*
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China's firewall that tries to sanitise web browsing is much more porous than previously thought, says a study.

Carried out by US researchers outside China, it found that the firewall often failed to block what the Chinese government finds objectionable.

The firewall was least effective when lots of Chinese web users were online.

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