https://www.reuters.com/article/us-usa-trump-russia-socialmedia/u-s-senators-hammer-facebook-for-power-over-elections-idUSKBN1D014V

U.S. senators on Tuesday pressed Facebook Inc's chief lawyer on why the company did not catch 2016 election ads bought using Russian rubles, why its investigation of them took so long and how much it knows about its 5 million advertisers.