Asked if there is any connection between Russians who are using Facebook and Mr. Trump's associates, Burr dismissed any notion of collusion. One ad seemed to promote Muslim women support for Hillary Clinton, while another hyped the Black Lives Matter movement - misspelling the name Black Lives Matter, according to a Politico source. Some of those ads included references to presidential candidates in the 2016 election.
Both panels have investigated how Russian groups could have used social media platforms and online ads to influence the 2016 election by spreading fake news and propaganda, and whether they were aided by people in the United States.
He also talked up Facebook's "get out the vote" effort, which he claimed helped at least two million people register to vote.
"Things change with a subpoena", Pollock, a Democrat, said as part of the panel.
Last week, Facebook founder Mark Zuckerberg said the company has shut down thousands of fake accounts created to attempt to influence elections around the world, and is working with the US government finding ways to make political advertising more transparent.
As with the Facebook accounts, the Twitter accounts sought to amplify political discord by highlighting hot-button political issues like race and immigration.
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House Intelligence Committee Representatives Mike Conaway and Adam Schiff leading the Russia probe announced on Wednesday that they had called for representatives of the firms themselves to testify on the issue of Russian manipulation.
"In many cases, it was more about voter suppression rather than increasing turnout".
Facebook, Twitter and Google were invited to open hearings before Congress in November on the investigation of Russia's role in the election. Officials from Twitter are set to meet behind closed doors Thursday with investigators from the Senate intelligence committee. Some championed activist groups like Black Lives Matter, while others portrayed them as existential threats.
"This is an ongoing process and we will continue to collaborate with investigators", the statement said.
Twitter pledged more transparency on what it is doing to take down bots and manipulative networks, saying, however, that there would be some components it could not publicly share.
Facebook CEO Mark Zuckerberg also said the company will work to make political advertising on its platform more transparent.