Anonymous is the internet collective famous for "Project Chanology" — co-ordinated worldwide protests against the controversial Church of Scientology — and has ties with web imageboards such as 4chan and internet forums like Something Awful.

As with Project Chanology, Anonymous members are planning on public protests outside Iranian embassies and consulates around the world to voice their opposition to internet censorship.

The forum also has the backing of massive BitTorrent tracking site The Pirate Bay, which has changed its logo to "The Persian Bay" and linked through to the protest site.

The Pirate Bay's three founders and a financier were recently convicted of violating copyright law in a Swedish court and ordered to pay $4.5 million in damages to several major entertainment companies.

The forum was yet another way for Iranian internet users to give their views on the country's recent election results, where President Mahmoud Ahmadinejad was re-elected last weekend.

The country has been in turmoil since the election result, with opposition protestors clashing with police and pro-government hardliners after accusations the poll was rigged.

The government shut down sites such as Twitter and YouTube, and also blocked mobile phone calls and text messages. (Read more: US asks Twitter to 'maintain service' in Iran)

This triggered a reprisal from opposition supporters, who orchestrated to co-opt less web-savvy protestors in denial of service attacks (DDoS), which crash websites with a flood of traffic.

Government websites, including President Ahmadinejad's personal site and blog, crashed as they were flooded with users marshalled through Twitter, Digg and other sources. (Read more: Opposition attacks Iran's government websites

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