https://www.reuters.com/article/us-imf-worldbank-facebook/facebooks-libra-cryptocurrency-faces-new-hurdle-from-g7-nations-idUSKBN1WW33B >Facebook's plans to launch its Libra cryptocurrency faced a new hurdle on Thursday when the Group of Seven wealthy nations said such "stablecoins" should not be allowed to launch until the profound international risks they pose are addressed.