Twitter, Facebook and Google are to be hauled in front of the US Congress again, to give testimony to the Senate Committee on Commerce, Science and Transportation for extremist content.
On 17 January, the three companies are required to give evidence on the steps they are taking to combat the spread of extremist propaganda over the internet, the committee has announced, in a hearing titled “Terrorism and Social Media: Is Big Tech Doing Enough?”.
https://www.theguardian.com/technology/2018/jan/10/facebook-google-twitter-testify-congress-extremist-content-russian-election-interference-information