10/22/2009 05:12 am ET | Updated May 25, 2011

China, Iran: World Leaders in Blocking the Internet

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!