https://www.reuters.com/article/usa-congress-facebook-whistleblower/facebook-operating-in-the-shadows-says-whistleblower-as-u-s-lawmakers-demand-probes-idUSKBN2GV10F >WASHINGTON (Reuters) -U.S. lawmakers pounded Facebook on Tuesday, accusing CEO Mark Zuckerberg of pushing for higher profits while being cavalier about user safety and they demanded regulators investigate whistleblower accusations that the social media company harms children and stokes divisions.