Updated at 2:17 p.m. ET, Oct. 3
Facebook said on Monday it has given Congress thousands of ads linked with Russian influence operations in the United States and is tightening its policies to make such interference more difficult.
"Many [of the ads] appear to amplify racial and social divisions," it said.
The social media giant confirmed that it discovered the ad sales earlier this year and gave copies to Justice Department special counsel Robert Mueller, who is investigating Russian interference in the 2016 election.