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Group conversations on WhatsApp, Telegram and other messaging apps are frozen in time. Foreign emails sent to friends inside the country go undelivered. Iranian Instagram — a vital domain for the self-expression of ordinary Iranians — has no new images. And tweets in Persian that claim to originate from Iran are being sent either from fake accounts and bots outside the country or from the small number of people who still have access to the Internet (among them, Supreme Leader Ayatollah Ali Khamenei).