Most of the world's dictators share a common fear, and it's not of the United States, NATO, the United Nations or any outside entity. No, the force that most threatens them is social media. Originally designed as enhanced online chat forums for young Americans, Facebook, Twitter, blogs and the rest have spread around the world and are now being used as cudgels against authoritarian leaders in places like Vietnam, Russia, Belarus and Bahrain. In those states and so many others, the leaders are attacking tweeters and bloggers as if they were armed revolutionaries. And the repression is spreading. In India ... a 21-year-old medical student posted a mildly critical comment about a Hindu political figure who'd just died. Within 24 hours, police arrested her and a friend who had liked" the student's Facebook post and charged them with engaging in hateful, offensive speech -- this in one of the world's strongest democracies. Recently, Ecuador's Supreme Court turned down an extradition request from Belarus for a blogger who fled there after the government charged him with fraud. Alexander Barankov had been blogging about widespread government corruption. Iran, not surprisingly, is even tougher. Bloggers are given long prison terms or sentenced to death, charged with "enmity against God" and subverting national security. But the sad truth is, the dictators whose people are the most repressed -- locked in abject poverty -- don't have to worry about the social-media problem.

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