With Twitter set to make its debut on American stock exchanges, a critical question looms: Can toppling dictators also be good business? Over the course of its seven-year history, Twitter has gone from scrappy, disorganized start-up to a heavyweight of the social media revolution. In the process, it's become much more than a business. From Tahrir Square to Gezi Park, Twitter has made itself indispensible to activists everywhere, providing a tool to decry abuse, organize protests, and help overthrow bad leaders.

Social media in China, which has nearly 600 million users, has long been recognized as a political game-changer. In a country where a one-party regime maintains tight censorship over traditional media, the relative freedom of expression available via Chinese social media, particularly Weibo (the Chinese equivalent of Twitter), has made it a powerful platform for rallying public opinion.

China's 591 million web users are encouraged to think twice about information they share through social media in order to avoid serious punishment. Anyone caught using social media to spread "slanderous rumors" or "false information" about the government or politics can face up to 10 years in jail, according to a new legal interpretation of Internet restrictions.

Prime Minister Benjamin Netanyahu responded tepidly to Hassan Rohani's Rosh Hashanah Twitter greetings on Saturday, saying he is not impressed by "Greetings coming from the mouth of a regime that only last week threatened to eradicate the State of Israel." Netanyahu added that the Iranian leadership will be evaluated through its actions, and not via greetings "whose only goal is to divert attention from the fact that even after the elections, it continues the enrichment of uranium and the cunstruction of a plutonium reactor meant to allow it to develop nuclear weapons that will threaten Isr

In recent days, the blogosphere and the international press have been abuzz over the public relations campaign undertaken by Iran's new president, Hassan Rouhani, and his foreign minister, Mohammad Javad Zarif. Tweets by accounts associated with both men — caveat: the president has not explicitly confirmed his —can be credited with nudging Iran’s public posture on Syria in a more moderate direction, and distancing the new Rouhani administration from the anti-Semitic trope of his predecessor, Mahmoud Ahmadinejad.

"I belong to the Syrian people," Syrian president Bashar al-Assad told the French journalist George Malbrunot, of the newspaper Le Figaro, earlier this week. "I defend their interests and independence and will not succumb to external pressure." Yes. That's what he said. There are many, many caveats to that little assertion, obviously, but one of the most noteworthy is this: The message wasn't just sent from President Assad to George Malbrunot. It was also sent from President #Assad to George #Malbrunot.

Iran's Foreign Minister Javad Zarif has confirmed reports of President Hassan Rowhani's well-wishes on Jewish new year on social networking platform Twitter on Thursday. CNN's Christiane Amanpour posted a message on Facebook stating that she had just spoken to the Iranian foreign minister who confirmed to her Rowhani' tweets. “Just spoke with Iran's foreign minister who confirms he IS tweeting and wishes Jews in Iran & around the world a happy new year!,” Amanpour wrote in a tweet.

A series of tweets by Iranian leaders over the past couple of days has students of diplomatic semantics — a sometimes exact science — wondering whether a mere greeting is an opening to the country’s adversaries. Both Iran’s new president, Hassan Rouhani, and the new foreign minister, Mohammad Javad Zarif, sent Rosh Hashanah greetings via Twitter to Jews celebrating the new year.