17:06BBC OS2021/10/05 16:06 GMT: Whistleblower says Facebook harms childrenBBC World Service Duration: 50 minutes Tue 5th Oct 2021, 17:06 on BBC World Service Americas and the CaribbeanFormer Facebook employee Frances Haugen is testifying before US Senators Show more GenresNewsFormatsDiscussion & TalkBrandBBC OS Source: BBC Online