Stephen Harper no relation Twitter
Twitter diplomacy is the use of the social media website Twitter by heads of state, leaders of intergovernmental organizations (IGOs), and their diplomats to conduct diplomatic outreach and public diplomacy.Twitter has hosted a variety of diplomatic communications, ranging from cordial announcements of bi-lateral cooperation to diplomatic jabs, to terse exchanges, as well as more casual posts.By heads of state and government
Former US President Barack Obama is credited as being the first head of state to establish a Twitter account, originally affiliated with his 2008 presidential campaign, on March 5, 2007, as user number 813,286.  He was also the most followed head of state on Twitter.Other heads of state and government to pioneer the conduct of Twitter diplomacy include Mexican president Enrique Peña Nieto, Belgian Prime Minister Elio Di Rupo, and Canadian Prime Minister Stephen Harper, all of whom joined Twitter in 2007.
Former US president Donald Trump, whose frequent and often controversial use of Twitter during the 2016 US presidential election campaign and since has become well known around the world, frequently engaged in Twitter diplomacy during his years in office.By diplomats and diplomatic missions
Former Israeli ambassador to the United States, Michael Oren, echoed the sentiment of many diplomats when responding to a May 2012 question about why he joined Twitter: "Today there are few alternatives as far-reaching and effective, with very wide audiences and young audiences, as Twitter. Twitter is another tool that enables me to communicate with other diplomats and journalists, while also allowing me to add a personal touch."The UK Foreign and Commonwealth Office, for example, published a consolidated list of all UK missions on social media.The United States State Department, one of the leaders in digital diplomacy, maintains an active presence on Twitter.  Although former United States Secretary of State Hillary Clinton encouraged American diplomats to tweet, she did not establish her personal handle until 2013, after she had already left office.  Moreover, former secretary John Kerry re-activated his personal Twitter handle after one year on the job.   Former US ambassador to the Russian Federation, Michael McFaul, pioneered the use of Twitter for American ambassadors with a steady stream of English/Russian tweets during his 2011–2014 tenure.  An academic by trade and not a career diplomat, Ambassador McFaul's tweets were generally blunt and un-polished—uncommon characteristics in the diplomatic world—earning both frequent criticism from the Russian government and praise from his supporters.
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