A Russian company that created fake accounts and pages purchased $100,000 worth of advertising during the USA election previous year, the company said.
"Our analysis suggests these accounts and Pages were affiliated with one another and likely operated out of Russian Federation", he said in a statement. The ad spending was from June of 2015 to May of 2017 and associated with roughly 3,000 ads.
"One question that has emerged is whether there's a connection between the Russian efforts and ads purchased on Facebook", Alex Stamos, the company's chief security officer, said in a statement.
Stamos said on Wednesday that Facebook has shared its latest findings with U.S. authorities investigating Russia's interference in the election. Facebook said about one-quarter of the suspect ads were geographically targeted, with more of those running in 2015 than 2016.
Facebook did not specify whether these were traditional advertisements or sponsored posts, but said they were meant to amplify "divisive social and political messages" ranging from "LGBT matters to race issues to immigration to gun rights".
Stamos said it is increasing its efforts to detect fake accounts and will not allow pages that share fake news to buy ads.
An unnamed Facebook official told the Washington Post that there was "evidence that some of the accounts" that promoted those ads "are linked to a troll farm in St. Petersburg, referred to as the Internet Research Agency, though we have no way to independently confirm".
Rather, the company review found that they focused on "amplifying divisive social and political".
Stamos said Facebook began its review to determine "whether there's a connection between the Russian efforts (to influence the USA election) and ads purchased on Facebook".
The site, and its founder Mark Zuckerberg, came under extremely heavy criticism for not taking the issue seriously in the days following President Donald Trump's election win. Some of those ads were bought using the Russian language, even though they were displayed to users in English.
One search for ads purchased from United States internet addresses set to the Russian language turned up $50,000 worth of spending on 2,200 ads.