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#TwitterDiplomacy: The Making of a Nuclear Deal

Iranian Foreign Minister Mohammad Javad Zarif, left, shakes hands with US Secretary of State John Kerry next to Chinese Foreign Minister Wang Yi (far L) and French Foreign Minister Laurent Fabius (far R) after a statement on early Nov. 24, 2013 in Geneva. FABRICE COFFRINI / AFP - Getty Images file

Ann Curry explores how a combination of high-level secret negotiations and social media brought the USA and Iran back from the brink of war.

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