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On May 1, 2009, the White House becomes the first official Twitter account of a sitting President. It was followed shortly after by the Rwandan President Paul Kagame (May 15, 2009) and the South African Presidency (May 18, 2009):

On November 12, 2009, then Mexican Ambassador in Washington Arturo Sarukhan becomes the first foreign Ambassador in the US Capital to use Twitter on an official capacity:

On May 25, 2011, Swedish Foreign Minister Carl Bildt contact his counterpart Khalid Al Khalifa of Bahrain via Twitter, as he was unable to reach him otherwise using traditional means of communication. The following day, Al Khalifa replies to Bildt via Twitter:

US President Barack Obama’s first tweet on the @whitehouse profile, from “Laptop One,” as some journalists referred to the laptop Obama used during the first White House live Twitter Townhall hosted by Jack Dorsey, was sent on July 6, 2011. It was the first Twitter Townhall by a sitting president:

The first Ambassador to use Twitter from behind closed doors at the United Nations Security Council, on February 4, 2012, then US Ambassador to the UN Susan Rice tweets addressing the position of China and Russia on Syria:

On February 6, 2012, Russia’s Foreign Minister Sergey Lavrov reacts to Ambassador Rice’s tweets via the Twitter handle of the Russian Ministry of Foreign Affairs:

On June 21, 2012, French News Agency Agence France Press launches the first ever Twitter-based portal on digital diplomacy:

On July 26, 2012, global public relations firm Burson-Marsteller launches the first Twiplomacy study on the use of Twitter by world leaders (BM later created the @Twiplomacy handle):

On September 13, 2012, the US Embassy in Cairo starts a back-and-forth Twitter conversation with the official English account of the Muslim Brotherhood:

On June 10, 2013, former US Secretary of State Hillary Clinton opens her Twitter handle:

After almost three years of Twitter silence, on September 27, 2013, Brasilian President Dilma Roussef is back on Twitter:

On October 1, 2013, Twitter’s founder Jack Dorsey engages with Iran Foreign Minister Hassan Rouhani on net freedom in Iran: