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When the former chief executive of Hong Kong hugged the Chief Secretary, Carrie Lam, at a ceremony to mark the Nanjing Massacre, it sparked speculation over who will be the next leader of the territory. It made our Hong Kong reporter, Helier Cheung, ponder the dos and don'ts of hugging in the different places she's lived. (Photo: (top left) Nicolas Sarkozy and Angela Merkel; (top right) Xi Jinping and Jean Claude Juncker; (bottom left) Pope Francis and Justin Welby; (bottom right) Nigel Farage and Diane James. Credit: Getty Images)