Providing new evidence of Russian interference in the 2016 election, Facebook disclosed on Wednesday that it had identified more than $100,000 worth of divisive ads on hot-button issues purchased by a shadowy Russian company linked to the Kremlin.
Most of the 3,000 ads did not refer to particular candidates but instead focused on divisive social issues such as race, gay rights, gun control and immigration, according to a post on Facebook by Alex Stamos, the company’s chief security officer. The ads, which ran between June 2015 and May 2017, were linked to some 470 fake accounts and pages the company said it had shut down.
Facebook officials said the fake accounts were created by a Russian company called the Internet Research Agency, which is known for using “troll” accounts to post on social media and comment on news websites.
The disclosure adds to the evidence of the broad scope of the Russian influence campaign, which American intelligence agencies concluded was designed to damage Hillary Clinton and boost Donald J. Trump during the election. Multiple investigations of the Russian meddling, and the possibility that the Trump campaign somehow colluded with Russia, have cast a shadow over the first eight months of Mr. Trump’s presidency.
Facebook staff members on Wednesday briefed the Senate and House intelligence committees, which are investigating the Russian intervention in the American election. Mr. Stamos indicated that Facebook is also cooperating with investigators for Robert S. Mueller III, the special counsel, writing that “we have shared our findings with U.S. authorities investigating these issues, and we will continue to work with them as necessary.”
Mr. Stamos wrote that while some of the ads specifically mentioned the two candidates, most focused instead on issues that were polarizing the electorate: “divisive social and political messages across the ideological spectrum — touching on topics from LGBT matters to race issues to immigration to gun rights.”
Facebook did not make public any of the ads, nor did it say how many people saw them. But Mr. Trump regularly offered outspoken comments on those issues during the campaign, denouncing “political correctness” and rallying his supporters on the right.
In its review of election-related advertising, Facebook said it had also found an additional 2,200 ads, costing $50,000, that had less certain indications of a Russian connection. Some of those ads, for instance, were purchased by Facebook accounts with internet protocol addresses that appeared to be in the United States but with the language set to Russian.
In a January report, the Federal Bureau of Investigation, Central Intelligence Agency and National Security Agency concluded that the Russian government, on direct orders from President Vladimir V. Putin, was responsible for hacking Democratic targets and leaking thousands of emails and other documents in an attempt to hurt Mrs. Clinton’s campaign and mar her reputation.
The report also found that hundreds of Russian “trolls,” or paid social media users, had posted anti-Clinton messages. But it did not name Facebook or address the question of advertising.
The January intelligence report said the “likely financier” of the Internet Research Agency was “a close Putin ally with ties to Russian intelligence.” The company, profiled by The New York Times Magazine in 2015, is in St. Petersburg and uses its small army of trolls to put out messages supportive of Russian government policy.
The revelations can only add to the political skirmishing in Washington over Russia’s role in the election. Mr. Trump has often dismissed the Russian hacking story as “fake news” and bristled at any implication that Mr. Putin had helped him win. To date, while news reports have uncovered many meetings and contacts between Trump associates and Russians, there has been no evidence proving collusion in the hacking or other Russian activities.
Representative Adam B. Schiff of California, the ranking Democrat on the House Intelligence Committee, said in a telephone interview that the Facebook disclosure “certainly quantifies the Russian use of at least one social media platform with a level of granularity that we did not have before.” He said the committee has been in touch with Facebook for some time, adding, “I don’t think this is the last word on the matter by Facebook or in terms of our investigation on the social media issue.”
Mr. Schiff said he has more questions for Facebook, including when the company first become aware of the problem, what warning signs it found, how sophisticated the Russian operation was and what steps Facebook was taking to guard against such activity in the future.
“Clearly Facebook doesn’t want to become the arbiter of what’s true and what’s not true,” Mr. Schiff said. “But they do have a civil responsibility to do the best they can to inform their users of when they’re being manipulated by a foreign actor.”