Facebook has turned over to USA special counsel Robert Mueller detailed records about the Russian ad purchases on its platform that go further than what it shared with Congress last week, according a report published September 15 on The Wall Street Journal's website.
Facebook said last week it found about US$100,000 (RM419,200) in ad spending connected to fake accounts probably run from Russian Federation.
The social network provided copies of ads and explained how they were targeted and who bought them, said the person, who asked not to be identified discussing an ongoing investigation. Facebook's policy states that, in accordance with the federal Stored Communications Act, it can only turn over the stored contents of an account in response to a search warrant.
Special Counsel Bob Mueller's investigation into Russian meddling in the 2016 election has obtained a warrant to investigate Facebook's role in spreading Russian misinformation to targeted US regions.
Sen. Mark Warner, the top Democrat on the Senate Intelligence Committee, told CNN last week that Facebook had not turned over the ads to Congress. Warner has also called Facebook's review "the tip of the iceberg", and suggested that more work needs to be done in order to ascertain the full scope of Russia's use of social media.
"That means that he has uncovered a great deal of evidence through other avenues of Russian election interference", she said.
Mariotti said that the Facebook warrant "means that Mueller has concluded that specific foreign individuals committed a crime by making a "contribution" in connection with an election".
President Donald Trump's team has denied working with Russian Federation to win the presidency, while Russian Federation has previously said it did not meddle with the USA election.
Some ads directly mentioned Donald Trump and Hillary Clinton during the presidential campaign.
There's more to the $100,000 in ads that Facebook sold to a Russian propaganda company. The ads were targeted at American Facebook users and covered issues like gun rights and immigration.
A Facebook spokesman told the newspaper that the company was continuing its probe and was cooperating with federal authorities.
"We know we have to stay vigilant to keep ahead of people who try to misuse our platform", said Stamos.