It's a high-tech, high-stakes game of cat-and-mouse.
As the Iranian government seeks to crack down on the online networks being used by protesters who question the nation's election results, a community of Net-savvy users -- both inside and outside the country -- are working to try to stay one step ahead.
"To the Iranian government hackers who keep attacking the places they see as a threat, you are wasting your time," wrote one anonymous poster to a message board loaded with eyewitness accounts of violence, plans for protests and notices about people reported missing or dead. 
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CNN's Peter Wilkinson in London contributed to this report.
All About Iran • Twitter Inc. • Internet