*Thanks for joining us. Some final thoughts on how the hearing went: * During the hearing, Senators pressed representatives from three technology giants to explain why they didn't recognize Russia-linked accounts earlier, as the officials struck a contrite tone about the role their services played in stoking political tensions during the 2016 campaign.

Facebook Inc., Alphabet Inc.’s Google and Twitter Inc. were all summoned in front of a subcommittee of the Senate Judiciary Committee on Tuesday, where officials told members of Congress that they were actively developing better policies for how to curb foreign activity on their platforms and ensure that foreign governments, terrorists and criminals aren’t able to abuse social media for nefarious purposes.

They also faced questions about voter-suppression efforts and whether Silicon Valley can or should police speech.

The tech companies emphasized that only a small fraction of the total political content that appeared on their platforms had any links to foreign governments, particularly Russia, which the U.S. intelligence community determined in January ran a campaign of hacking and disinformation aimed at influencing the 2016 presidential election. They promised to take more responsibility for policing political content on their platforms in the future.