The committee also took a shot at Alphabet CEO Larry Page, who declined an invitation to appear, by leaving out an empty chair. Follow the live blog below. "Congress is going to have to take action here", Warner said.
On Wednesday, September 5, at 1:30 pm EST (September 6, 1:30 am Manila time), Dorsey will discuss the social media platform's algorithms and the way it moderates its content.
Facebook, she said, is "investing heavily in people and technology to keep our community safe and keep our service secure", including doubling the number of people working on safety and security issues to 20,000. "As [Sen. Richard Burr (R-N.C.)] has noted, 'Nothing less than the integrity of our democratic institutions, processes and ideals is at stake.' We agree, and we are determined to meet this challenge". Facebook CEO Mark Zuckerberg testified to Congress about Facebook's role in the 2016 election in April.
Google says Walker will still submit testimony and brief members on the subject of the hearing, which is foreign influence operations and their use of social media platforms.
Earlier this year the company said it was taking aggressive measures to combat inauthentic accounts.
The Twitter CEO will also make a solo appearance before the House Energy and Commerce Committee, where Dorsey is expected to face tough questioning on allegations that the social platform has suppressed conservative voices.
To kick off his opening statement, Dorsey picked up his phone and said he would be tweeting out his prepared testimony.
"You don't understand the problem if you don't see this as a large effort from whole of government and the private sector", Burr told reporters at the Senate.
According to the newspaper, there were at least two separate occasions where Dorsey favored keeping the far-right activists on the social media platform. Now, executives from some of those giants will tell lawmakers the steps they have taken since to prevent similar attacks.