However, congressional investigators say that if Russian messengers used fake identities, they would have no legal claims to privacy.
"Things happened on our platform in this election that should not have happened", Sandberg said. Sandberg told congressional investigators on Thursday that in addition to the ads, the company would provide the rest of the information from accounts linked to Russian Federation, the spokesman said.
Congress has been investigating Russia's meddling in the 2016 campaign, including whether the Trump campaign colluded with the country to win the election.
Congressional sources said some of the Facebook messaging went to groups with seemingly legitimate names such as Heart of Texas, Defend the Second, and United Muslims of America, which they said all had as many as 250,000 followers.
The social media platform has announced that it would take steps in the coming months to protect election integrity around the world.
Sandberg is meeting with elected officials in Washington this week ahead of a House hearing at which executives from Facebook, Twitter and Google are expected to testify. Before her time at Google and later Facebook, she worked for Larry Summers, the treasury secretary under President Bill Clinton.
"We do not want this kind of foreign interference in Facebook", she added.
Some 470 accounts spent a total of approximately $100,000 between June 2015 to May 2017 on ads that touted fake or misleading news, according to Facebook. "Not just an apology, but determination for our role in enabling Russian interference during the election", she said.
"We have a set of strict ads policies including limits on political ad targeting and prohibitions on targeting based on race and religion", a Google spokeswoman said, asked about the issue. Rep. Cedric Richmond, a Louisiana Democrat who chairs the caucus, said Sandberg promised to appoint an African-American to the board, a move the caucus and other activists have been pushing for years. Currently, Facebook's eight-member board of directors is all white and 75 per cent male.