A picture showing two female Chinese athletes which makes an unintentional reference to the Tiananmen Square massacre appears to have been censored on social media in China. Gold medal winner Lin Yuwei was being embraced by Wu Yanni after the 100m hurdles final at the Asian Games when their race numbers formed '64'. The number is seen as a reference to the 4 June massacre in 1989, when hundreds of pro-democracy protesters were shot dead by troops. The picture had been posted on Weibo, which is one of China's biggest social media platforms, but appeared to later be unavailable. The…