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The flood gates have opened in a Congressional probe into how suspected Russian entities used social media to spread misinformation designed to influence America's presidential election.

On Thursday, Twitter, which has kept relatively quiet about suspected use of the platform for election meddling, will appear before Senate and House Intelligence Committee members.

The move comes as Facebook begins to hand over 3,000 Russian-linked ads, including payment data and details on how Russian entities targeted voters through Facebook's system.

A Facebook representative told NBC News on Wednesday the company is in the process of providing information to Special Counsel Robert Mueller's office. The House and Senate intelligence committees are also set to receive the advertisements as part of their ongoing probe into Russian interference in the election.

Senate Intelligence Chairman Sen. Richard Burr, right, and committee Vice Chairman Sen. Mark Warner Manuel Balce Ceneta / AP

Facebook and Twitter representatives also confirmed to NBC News they received invitations to testify at an open hearing before Congress next month regarding the election probe.

It was unclear which executives might testify at the hearing.

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"The question is, we’ve contacted the most senior officials (from Twitter, Facebook and Google), but we’ll be in conversations about who’s going to have the most relevant information," Sen. Mark Warner told reporters.

Related: Facebook Says It Will Hand Over Russia-Linked Ads to Congress

Earlier this month, Facebook revealed the results of an investigation, which found a suspected Russian operation spent $100,000 on issues-related advertisements from June 2015 to May 2017 with the intent to sway votes in the U.S. election.

On Wednesday, Facebook CEO Mark Zuckerberg responded to a tweet from President Donald Trump, which claimed "Facebook was always anti-Trump. The Networks were always anti-Trump." He also mentioned The New York Times and The Washington Post and asked, "Collusion?"

"Trump says Facebook is against him. Liberals say we helped Trump. Both sides are upset about ideas and content they don't like. That's what running a platform for all ideas looks like," Zuckerberg said.

Twitter is rethinking its terms in the Trump era. NurPhoto / NurPhoto via Getty Images

Rep. Mike Conaway (R-TX) and Rep. Adam Schiff (D-CA), the bipartisan team leading the House Permanent Select Committee on Intelligence's investigation into Russian interference, issued a joint statement on Wednesday outlining the next big public step in the investigation - hearing from Facebook and other technology companies in an open hearing.

"In the coming month, we will hold an open hearing with representatives from tech companies in order to better understand how Russia used online tools and platforms to sow discord in and influence our election," they said.

It was not yet known whether Zuckerberg might testify at that open hearing. However, his lengthy response on Wednesday aimed to put Facebook's role in the election into perspective.

He said the facts suggest "the greatest role Facebook played in the 2016 election was different from what most are saying."

"Campaigns spent hundreds of millions advertising online to get their messages out even further. That's 1000x more than any problematic ads we've found," he said.

With this being the first election where the internet truly played a starring role, candidates were able to directly communicate with tens of millions of followers through their Facebook pages. In addition, Zuckerberg said there were billions of interactions on Facebook discussing the issues, including well beyond what was covered in the media.

"After the election, I made a comment that I thought the idea misinformation on Facebook changed the outcome of the election was a crazy idea. Calling that crazy was dismissive and I regret it," he said.

"This is too important an issue to be dismissive. But the data we have has always shown that our broader impact -- from giving people a voice to enabling candidates to communicate directly to helping millions of people vote -- played a far bigger role in this election."

It's not the first time Trump directly took aim at Facebook and the Russian advertisements. In a tweet earlier this month, he appeared to dismiss the scrutiny of ads on Facebook.

The Russia hoax continues, now it's ads on Facebook. What about the totally biased and dishonest Media coverage in favor of Crooked Hillary? — Donald J. Trump (@realDonaldTrump) September 22, 2017