https://techcrunch.com/2017/10/04/senate-intel-committee-burr-warner-facebook-ads/

In an update on the progress of its investigation into Russian interference in the 2016 U.S. election, the Senate Intelligence Committee weighed in on recent revelations that have implicated major tech companies. The committee plans to hear open public testimony from Facebook, Twitter and Google on November 1 pertaining to their role in selling political ads to Russian government entities and fostering an environment in which shadowy foreign-funded political propaganda efforts could thrive.

According to the Chairman Richard Burr, it took time for tech leaders to warm up to the notion that they were responsible for influence campaigns run on their platforms. “I was concerned at first that some social media platforms did not take this thread seriously enough,” Burr said. “The three companies we’ve invited, Google, Twitter and Facebook, will appear in a public hearing.”