https://www.reuters.com/article/us-facebook-cambridge-analytica-kogan/senate-subcommittee-seeks-information-on-facebook-data-idUSKBN1GY2LS >A U.S. Senate subcommittee on Thursday sought information from a Cambridge University researcher about how the personal data of 50 million Facebook users landed in the hands of a political consulting firm that worked for U.S. President Donald Trump's campaign.