https://www.reuters.com/article/us-usa-trump-russia-tech/facebook-twitter-google-executives-to-testify-at-u-s-senate-russia-hearing-idUSKBN1CW2VE >Executives from Facebook Inc , Twitter Inc and Alphabet Inc's Google will testify on Tuesday before a Senate Judiciary subcommittee hearing on allegations of Russian interference in the 2016 U.S. presidential election.