Twitter CEO Jack Dorsey tweets opening testimony during congressional hearing

Twitter's Jack Dorsey left and Facebook's Sheryl Sandberg

Before the hearing, President Donald Trump, without offering evidence, accused the companies themselves of interfering in the upcoming USA mid-term elections, telling the Daily Caller that social media firms are "super liberal".

Top Google officials, including Larry Page, CEO of parent company Alphabet, and Sundar Pichai, CEO of the Google brand, declined invitations from congressional leaders to testify at the hearings. Follow the live blog below.

Facebook COO Sheryl Sandberg and Twitter CEO Jack Dorsey are on Capitol Hill today answering questions about foreign influence and use of social media for disruption and other bad acts. "It violated the values of our company and of the country we love".

"The actions we've taken in response. show our determination to do everything we can to stop this kind of interference from happening", Sandberg said.

Top executives from social media behemoths Facebook and Twitter are set to testify Wednesday before lawmakers about the ongoing threat of foreign influence operations on their platforms, as the shadow of possible Russian interference looms over the 2018 midterm elections.

Twitter's Dorsey was to follow his Senate testimony with an appearance at an afternoon hearing looking at that issue in the House of Representatives. Mark Zuckerberg, the company's founder and CEO, faced tough questioning on the platform's internal practices when he testified before Congress in the wake of the Cambridge Analytica data breach scandal.

"Clearly this problem is not going away; I'm not even sure it's trending in the right direction", Burr said of the threat to United States elections from foreign influence operations on social media platforms. Google says it continues to use "advanced technologies" to increase security and fight manipulation on its platforms.

Earlier this year the company said it was taking aggressive measures to combat inauthentic accounts. Twitter has been accused by some of suppressing conservative voices on the platform - which the company denied in July.

"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. Now, executives from some of those giants will tell lawmakers the steps they have taken since to prevent similar attacks.

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