The US Intelligence Committee chief Richard Burr has said that the probe into alleged Russia's meddling into the 2016 US Presidential election has not come to a definitive conclusion, however no vote totals were affected.
"The issue of collusion is still open".
In a statement on Monday, Facebook said it would add more than 1,000 people over the next year and invest more in software to flag and take down ads automatically.
"We've got to make our facts, as it related to Russia's involvement in our election before the primaries getting started in 2018", Burr said.
"We will share with you when we have exhausted every thread of intelligence, every potential witness that can contribute anything to this", he said.
Mr Burr said the committee has interviewed more than 100 witnesses as part of its investigation and that more work still needs to be done. The panel has sifted through emails, text messages, highly classified intelligence reporting, and more.
The company made the announcement after turning over 3,000 ads to congressional investigators examining Russian interference in the United States election. But he stressed that the panel has not yet released concrete, sealed results of the probe.
The committee generally endorses the intelligence community's conclusions, he said.
Dozens of intelligence and political officials have been interviewed since the investigation began in January. "They've been unbelievably cooperative".
The assessment concluded that Russian President Vladimir Putin ordered a campaign to undermine the US election and favor then-candidate Donald Trump over Hillary Clinton.More news: Google Home Mini: Google launches little rival to Amazon's Echo Dot
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Burr said the committee has yet to find "any hint of collusion" but it is still conducting interviews and reviewing documents, including 25 additional interviews this month. "If somebody has come in and not been truthful with us, we will catch them on that, and they will come back".
The panel has interviewed everyone that was involved in drafting the campaign platform, he said.
Russian Federation has repeatedly denied any meddling in the election.
Burr added that investigators have "exhausted" every witness for pertinent information on the so-called "Comey memos", or notes that Federal Bureau of Investigation director James Comey kept to detail his interactions with the president. The intent of the press conference was to give an update on the committee's investigation.
The U.S. intelligence community consensus is that Russian Federation interfered in the 2016 U.S. election with the intent of helping elect Trump and undermine U.S. faith in its elections.
The Republican said the panel can not determine the dossier's credibility without understanding who paid for it and who contributed to the material. "Who were your sources?"
Mark Warner criticized Twitter last week for its response to Russian meddling, calling the company's briefing to congressional investigators "deeply disappointing".
Burr and Warner may divulge more information about social media's role in the election.
"There will be more forensics done by these companies", Warner said.