Female panda Er Shun and her mate, Da Mao got a celebrity greeting from politicians and media at the Toronto airport upon their arrival in Canada. [...] Pandas, an endangered species native to China, are carefully meted out by Beijing to reward its foreign allies, and their arrival was hailed at the time as a sign of thawing relations between Beijing and Ottawa.

Plenty of diplomatic deals get done on the margins of global get-togethers, but one conducted on Twitter in 2014 made Prime Minister Stephen Harper a digital star among his fellow world leaders.(...) Most world leaders use the social media tool to broadcast specific messages; Harper is among many who don't generally reply when messages are sent their way.