“This has been a difficult decision,” Colin Stretch, Facebook’s general counsel said in a blog post. Disclosing content is not something we do lightly under any circumstances.”

Facebook founder Mark Zuckerberg last year dismissed the idea that fake news, which he characterized as “a very small amount” of the social media platform’s content could have an impact, calling it “a pretty crazy idea.”

But on Sept. 6, with concern mounting over anonymous political ads, Facebook’s management admitted it had found 3,000 Russia-related ads connected to 470 inauthentic accounts and pages which had spent $100,000 in violation of its policies.

“We are in a new world,” Zuckerberg said in a live broadcast and post on his Facebook Friday. “It is a new challenge for internet communities to deal with nation states attempting to subvert elections.”

Google, Twitter, Reddit and Other Internet Companies May Be Drawn Into U.S. Investigation of Russian Election Interference

A U.S. Congressional investigation into Russia’s involvement in the 2016 presidential election may go beyond Facebook, a member of the committee and the top Democrat leading the investigation told technology news site Recode Sept. 20.

“Just as the case with Facebook … I think the Russians actively used Twitter accounts,” Warner said, adding that he believes Twitter doesn’t screen out as many anonymous or fake accounts as Facebook.

He also expressed concern about the popular news-sharing site Reddit and possible manipulation of Google search results related to the election.

Senator Warner plans to hold a Senate Intelligence Committee hearing in October, at which the tech giants would testify, although a date has not been set nor have the Internet companies received invitations to testify, said Recode.

Mueller Asks White House to Turn Over Air Force One Phone Records Related to Meeting with Russian Lawyer at Trump Tower

Special Counsel Robert Mueller, leading a probe into the relations of the Trump campaign to Russia, has requested that the White House turn over phone records from Air Force One, the presidential plane, related to a June meeting between Trump’s son and a Russian lawyer, the U.S. news site The Hill reported.

President Donald Trump initially drafted a statement about his son’s meeting while flying home from Germany on July 8, saying the lawyer, Natalya Veselnitskaya, a former Moscow Region prosecutor and counsel to the Russian-owned Prevezon Holdings in a U.S. money-laundering case “had primarily discussed a program about the adoption of Russian children.”