BBC: The Instagrammers who worry Iran. “As the only major social media network not blocked by the government, Instagram is a popular platform for young Iranians to express themselves. This has created a dilemma for the government, which experts say is loath to block the tool for fear of provoking unrest, hampering business owners who rely on it for advertising, and severing a useful means of communication with its citizens. Instead, the government has attempted to act as a moderator.”