Facebook is now part of the Russia probe. Here's what senators want to know.

Sen. Mark Warner said he wants to touch on several topics when lawyers for Google, Facebook and Twitter testify about the scope of Russia's use of social media to meddle in the 2016 U.S. presidential election. Those include...

• A fuller explanation of what happened in 2016.
• How the companies can work with lawmakers "to make sure this doesn't happen on a going-forward basis."

Meg Wagner@megwagner

Mark Warner is answering questions about the Russian troll farm that generated Facebook content  http://snpy.tv/2z6hgg9 

October 31, 2017 2:42pm GMT

Today, the Internet giants will testify in front of the Senate Judiciary Subcommittee on Crime and Terrorism. They'll testify in public hearings with the Senate and House Intelligence Committees later this week.

In written testimony for the hearing with the judiciary committee, Facebook said roughly 126 million Americans may have been exposed to content generated on its platform by a Russian government-linked troll farm.

Facebook estimates 126 million people were served content from Russia-linked pages

Facebook will inform lawmakers this week that roughly 126 million Americans may have been exposed to content generated on its platform by the Russian government-linked troll farm known as the Internet Research Agency between