Although the number of ads is relatively small, the disclosure provides a more detailed peek into what investigators believe was a targeted effort by Russians to influence US politics during the campaign, this time through social media.
The 470 accounts appeared to come from a notorious "troll farm," a St. Petersburg-based organization known for promoting pro-Russian government positions via fake accounts, according to two people familiar with the investigation.
In all, the accounts purchased some 3,000 ads between June 2015 and May 2017. While the ads didn't specifically reference the election, a candidate or voting, they nevertheless allowed "divisive messages" to be amplified via the social media platform, the company's chief security officer, Alex Stamos, said in a statement.
Facebook has turned over its findings to federal authorities investigating Russian interference in the US presidential election. Robert Mueller, the special counsel, is charged with overseeing Russian meddling in the US election and any potential coordination with associates of President Donald Trump.
He did not say when a meeting with representatives from Twitter might occur other than "soon."
A spokeswoman for Twitter declined comment Wednesday evening.
Warner said he also wants to know more about the content of the ads pushed out by the Russian-based Internet Research Agency and whether they targeted specific voters or locations in the US.
Rep Adam Schiff, the top Democrat on the House Intelligence Committee, said Facebook's disclosure confirmed what many lawmakers investigating Russian interference in the US election had long suspected.
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