Special counsel Robert Mueller's investigation into Russia's efforts to meddle in the 2016 presidential election is focusing increasingly on how Moscow used social media to disrupt the presidential race, according to a Bloomberg report.

That involves seeking additional information about Russian activities on Facebook and Twitter. Facebook disclosed last week that a Kremlin-linked company purchased more than $100,000 worth of ads on its platform that ran between June 2015 and May 2017.

Those ads were linked to nearly 500 fraudulent accounts that likely operated out of Russia and focused on hot-button issues like immigration and gun control.

Likewise, Twitter is expected to hand over to Congress an analysis of Russian activity on its platform, similar to the one provided by Facebook last week.

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Social media has become an increasingly vulnerable target for foreign nations to try to influence the elections and policies of other countries, according to Bloomberg. U.S. intelligence agencies, including the FBI and the Office of the Director of National Intelligence, are exploring how to prevent future election meddling.

Meanwhile, National Intelligence Director Dan Coats Daniel (Dan) Ray CoatsFBI chief says Russia is trying to interfere in election to undermine Biden The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Former Intel chief had 'deep suspicions' that Putin 'had something on Trump': book MORE warned that Russia is stepping up its cyber operations, saying Wednesday that Moscow has "assumed an even more aggressive cyber posture by increasing cyber espionage operations and leaking data stolen from those operations."

Congressional investigators are also turning their attention increasingly toward the role of social media in Russia's election meddling efforts.

Sen. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.), the chairman of the Senate Intelligence Committee, said on Tuesday that his panel would likely interview Facebook officials as part of its investigation into Russian interference in the election, according to Bloomberg.

Rep. Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (D-Calif.), the ranking member of the House Intelligence Committee, told Bloomberg that his panel has been talking with tech companies, including Facebook, about the matter.