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ADVANCE FOR RELEASE SUNDAY, MARCH 11, 2018 AND THEREAFTER - FILE - In this Nov. 1, 2017, file photo, from left, Facebook General Counsel Colin Stretch, Twitter Acting General Counsel Sean Edgett and Google Senior Vice President and General Counsel Kent Walker are sworn in for a Senate Intelligence Committee hearing on Russian election activity and technology, on Capitol Hill in Washington. Much of what happens in political campaigns today takes place in the often murky world of social media, where the sources of ads do not have to be disclosed and hoaxes spread quickly. The 2016 presidential race featured Russian interference that included covert ads on social media and phony Facebook groups pumping out falsehoods. (AP Photo/Jacquelyn Martin, File)