 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.US president Donald Trump (who's frequent and often controversial use of Twitter during the 2016 US presidential election campaign and since has become well known around the world) has actively engaged in Twitter diplomacy during his years in office.As of April 2014, the United Nations (UN) is the most followed intergovernmental organization, with its website showing over 2.56 million viewers in April 2014.