Facebook revealed on Wednesday that the campaigns of Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE and Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE spent a combined $81 million on election ads during last year's presidential race.

The news came during a Senate Intelligence Committee hearing focused on Russia's use of social media platforms to try to sway the outcome of the election.

Sen. Roy Blunt Roy Dean BluntCDC tells Congress it urgently needs billion for vaccine distribution On The Money: Trump undercuts GOP, calls for bigger COVID-19 relief package | Communities of color hit hardest financially by COVID-19 | Businesses, states pass on Trump payroll tax deferral Trump undercuts GOP, calls for bigger COVID-19 relief package MORE (R-Mo.) asked Facebook's general counsel, Colin Stretch, about the campaigns' spending figures to contrast them with the amount spent on political ads by a Russian "troll farm."

Stretch said that the fake Russian accounts had spent about $46,000 on ads in the run-up to the election.

The campaigns' expenditures on Facebook have not been available in public filings because the ad purchases are often made through intermediaries.