Facebook has been accused of being “very good at dancing with data” and making hate “unquestionably worse” by a former employee turned whistleblower. Frances Haugen took questions from MPs and peers on Monday afternoon after releasing thousands of pages of internal research documents she secretly copied before leaving her job in the company’s civic integrity unit. The whistleblower shed light on her time with the tech giant, saying there was a “weak spot” on who you could turn to for escalating concerns.