But it had not yet given the ads to Congress, despite having told congressional investigators more than two weeks ago that it had sold more than 3,000 ads to accounts linked to a Russian troll farm between June 2015 and May 2017.
The social media platform had acknowledged about $100,000 (£74,000) in ad spending connected to fake accounts probably run from Russian Federation and was expected to be called before the Senate Intelligence Committee for a public hearing in October. It launched its own investigation, and according to the Washington Examiner on September 6, it passed its findings to Robert Mueller, the special counsel investigating alleged Russian interference in the election.
In a statement, the company said it had already given the ads in question to Mueller, and would now share them with Congressional investigators as well.
Other steps Zuckerberg announced include stronger policies for review at the company for political ads and it will add another 250 employees to focus on election integrity and security. As part of this co-operation it will share information about 3,000 political advertisements linked to Russian Federation with investigators.
The state of the investigation into whether Russian Federation interfered in the 2016 USA presidential election may be heading into risky territory for some major news outlets with close ties to the giant state.
"Going forward and maybe the most important step we're taking is we're going to make political advertising more transparent".More news: US and N Korea skip UN Treaty on Prohibition of Nuclear Weapons
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Instead the company plans to implement other changes for advertisers, ad buyers, and its users: In the coming months, Facebook will require advertisers to disclose which page paid for an ad. Congressional Democrats asked the Federal Election Commission this week to devise ways to prevent foreign influence on US elections, including possible new laws or regulations. Facebook previously angered congressional officials by showing only a sample of the ads, some of which attacked Hillary Clinton or praised President Donald Trump.
Facebook won't catch everyone immediately, he added, but it can "make it harder to try to interfere".
"We are in a new world".