https://www.cnbc.com/2017/09/27/facebook-google-and-twitter-asked-to-testify-on-russia.html

Senate lawmakers investigating Russian interference in the 2016 presidential election have asked Facebook, Google and Twitter to testify at a Nov. 1 hearing, a source familiar with the matter told Recode on Wednesday.

The inquiry — to be held by the Senate Intelligence Committee — could subject the three tech giants and their executives to uncomfortable questions about the extent to which Kremlin-backed forces may have used their platforms to spread misinformation, and what those companies might have done differently to stop it.