The International Campaign for Tibet has been collecting social media posts from Chinese tourists about Tibet that reveal far more than Tibetans themselves are allowed to share, and more than foreigners are allowed to see.

After the Twitter block in Turkey failed so spectacularly last week—sending the numbers of in-country tweets sky high—the authorities responded by blocking Google DNS, one of the most popular ways of circumventing the Twitter ban. The action has earned Turkey the dubious distinction of being the first country to block Google DNS.

China keeps foreign media in the country on a tight, short leash, capping the number of foreign films at 34 a year. They also have an ever-expanding system of censoring the web known as the Great Firewall. So it surprised many when it turned out that House of Cards is wildly popular in China, and that it had “survived” the country's notorious censors. Well, that time might be coming to an end. The state media watchdog will now be following the “censor first, broadcast later” policy for streaming content that feature films have endured for decades.

Since 2011 the NGO March Lebanon has been curating examples of censorship in Lebanon in a Virtual Museum of Censorship.

If you've entered your email into the MIT Media Lab Immersion platform, you might have some idea of the information that can be gleaned from metadata. The same is true of social networks like Twitter and Facebook. One researcher has found that analysis of social network metadata can reveal wide scale censorship with 85 percent accuracy, without needing to track sensitive keywords.

On February 26, a U.S. federal appeals court ordered Google Inc to remove the film “Innocence of Muslims” from YouTube for copyright violations. The film sparked protests throughout the Middle East after it was released in September 2012, and demonstrations in parts of Pakistan turned violent. Pakistan's Prime Minister ordered YouTube to be blocked, ostensibly to prevent any further violence as a result of “Innocence of Muslims.” The Pakistani Internet rights organization Bytes For All has challenged the YouTube ban in court, and now that Google has been ordered to remove the film from YouTube, point out that there is now no reason to keep the site blocked.

As protests in Venezuela approach the two-week marker, news stories are just as much about what we don't know as what we do: “Venezuela Is Divided Even on Its Death Toll”; “These Photos Being Shared From Venezuela Are Fake”; “The Game Changed in Venezuela Last Night – and the International Media Is Asleep At the Switch.”