A tweet can be taken as a meaningless aside, except when it's written by the President of the United States. Donald Trump's social media lack of diplomacy has sent shockwaves across the already troubled terrain of US-Iran relations. We've had the pull-out from the Iran nuclear deal, an Iranian ultimatum to Europe, more sanctions imposed by Trump on Iran, and a US aircraft carrier sent to the Persian Gulf. Could the war of words spiral out of control?

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