Censorship of Twitter
Censorship of Twitter occurs in accordance with the laws of the countries in which people use the service. On processing a successful complaint from "government officials, companies or another outside party" about an illegal tweet, Twitter will notify users from that country that they may not see it.
Twitter is blocked in China; however, many Chinese people use it anyway. In 2010 Cheng Jianping was sentenced to 1 year in a labor camp for retweeting a comment that suggested boycotters of Japanese products should instead attack the Japanese pavilion at the 2010 Shanghai Expo. Her fiancé, who made the initial tweet, claims it was actually a satire of anti-Japanese sentiment in China.
Twitter was inaccessible in Egypt on 25 January 2011 during the 2011 Egyptian protests. Some news reports blamed the government of Egypt for blocking it, and Vodafone Egypt, Egypt's largest mobile network operator, said it wasn't their action; however, Twitter's news releases did not state who the company believes instituted the block. As of January 26, Twitter was still confirming that the service was blocked in Egypt. On January 27, various reports claimed that access to the entire Internet from within Egypt had been shut down.
Shortly after the Internet shutdown, engineers at Google, Twitter, and SayNow, a voice-messaging startup company acquired by Google in January, announced the Speak To Tweet service. Google stated in its official blog that the goal of the service was to assist Egyptian protesters in staying connected during the Internet shutdown. Users could phone in a tweet by leaving a voicemail and use the Twitter hashtag #Egypt. These tweets could be accessed without an Internet connection by dialing the same designated phone numbers. Those with Internet access could listen to the tweets by visiting twitter.com/speak2tweet.
Following the posting of an antisemitic and racists posts by anonymous users, Twitter removed those posts from its service. Lawsuits were filed by the Union of Jewish Students (UEJF), a French advocacy group and, on 24 January 2013, Judge Anne-Marie Sauteraud ordered Twitter to divulge the personally identifiable information about the user who posted the antisemitic post, charging that the posts violated French laws against hate speech. Twitter responded by saying that it was "reviewing its options" regarding the French charges. Twitter was given two weeks to comply with the court order before daily fines of €1,000 (about US$1,300) would be assessed. Issues over jurisdiction arise, because Twitter has no offices nor employees within France, so it is unclear how a French court could sanction Twitter.  
In 2009, during 2009 Iranian presidential election, the Iranian government blocked Twitter due to fear of protests being organised. However, after four years of the blocking of Twitter website, as of September 2013, the blocking of both Twitter and Facebook has been lifted without notice. 
In August 2010, the Government of South Korea tried to block certain content on Twitter due to the North Korean government opening a Twitter account. The North Korean Twitter account created on August 12, uriminzok, loosely translated to mean "our people" in Korean, acquired over 4,500 followers in less than one week. On August 19, 2010, South Korea's state-run Communications Standards Commission banned the Twitter account for broadcasting "illegal information." According to BBC US and Canada, experts claim that North Korea has invested in "information technology for more than 20 years" with knowledge of how to use social networking sites. This appears to be "nothing new" for North Korea as the reclusive country has always published propaganda in its press, usually against South Korea, calling them "warmongers." With only 36 tweets, the Twitter account was able to accumulate almost 9,000 followers. To date, the South Korean Commission has banned 65 sites, including this Twitter account.
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