Estonian President sending his first tweet in 2012
Irish President Michael Higgins sending his first tweets in 2010 on the campaign account.
Pope Benedict XVI joining Twitter in 2012 as . The tweet has been deleted and is archived on the Vatican's website.
Former Swedish Foreign Minister reaching out to his Bahraini colleague in 2011 was the first twiplomatic exchange
Iranian President tweeting his phone conversation with . The tweet was deleted shortly afterwards.
's victory tweet in 2012 went viral and became one of the most retweeted tweets of all time
's one-word reaction to receiving the Nobel Peace Prize in 2009 went largely unnoticed in comparison
In 2014 Western allies and Russia waged a Twitter war over Crimea after its incorporation into Russia
Indian Prime Minister put his Chinese counterpart Li Keqiang on Twitter with this selfie in 2015
The Prime Minister of Namibia, now its president, summing up his Twitter strategy in 2014