https://www.reuters.com/article/usa-congress-facebook-whistleblower/facebook-whistleblower-to-say-former-employer-an-urgent-threat-to-u-s-idUSKBN2GV10F >Facebook whistleblower Frances Haugen will appear before the U.S. Congress Tuesday, where she is set to sharply criticize her former employer as "one of the most urgent threats" facing the country, and to demand transparency about its operations in order to better regulate it.