By Elizabeth Culliford and Raphael Satter (Reuters) - Facebook Inc said on Wednesday it had blocked a group of hackers in China who used the platform to target Uighurs living abroad with links to malware that would infect their devices and enable surveillance. The social media company said the hackers, known as Earth Empusa or Evil Eye in the security industry, targeted activists, journalists and dissidents who were predominantly Uighurs, a largely Muslim ethnic group facing persecution in China