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China, Iran: World Leaders in Blocking the Internet

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Herdict, an Internet censorship tracking service launched by Harvard's Berkman Center for Internet and Society, has started aggregating their user-reported Internet blockages.

Iran and China stand out in the reported number of blockages of Facebook, Flickr, Twitter and YouTube. Interestingly, Mexico has quite a few blockages as well.

Check out the site for more detailed data and be sure to report when you are unable to access a site in your country!

Here's an earlier posting I did about the site with the founder, Jonathan Zittrain.