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In pictures: the sites they tried to ban

If recent uprisings in the Middle East have taught us anything, it's that people will defend their right to free speech until their dying breath. No one likes to be gagged. However, that hasn't stopped many nations from trying.

China and Iran are among the world's most heavily censored nations, with Turkey, Saudi Arabia and Bahrain not far behind. Meanwhile, internet access is virtually non-existent in North Korea.

So, why are an increasing number of nations attempting to block out whole chunks of the online world and which sites are topping their list of targets? We reveal all in our list of sites they tried to ban...