https://www.theverge.com/2017/10/4/16421568/senate-russia-investigation-select-committee-facebook-ads

In a press conference today, Senator Mark Warner (D-VA) called for stronger regulation of online ads. Sen. Warner appeared with Senator Richard Burr (R-NC) on behalf of the Senate Select Committee on Intelligence, which has been investigating Russian interference in the 2016 elections. Facebook has been cooperating with the committee’s investigation, but has drawn some criticism for not immediately providing ads linked to Russian election interference.

“I was concerned at first that some of these social media platform companies did not take this threat seriously enough,” Sen. Warner told reporters. “I believe they are taking it seriously now.”