https://www.theregister.co.uk/2017/09/21/facebook_twitter_in_russia_investigation/

They may still view themselves as open purveyors of free speech, but increasingly social media giants are being pulled into the US Senate's investigation of Russian interference in the American presidential elections.

This week Twitter confirmed that it is going to meet the Senate's intelligence committee that is heading up the probe next week. It is expected to discuss the issues of fake accounts as well as the spread of fake news across its service.