The top spender was listed as a Beto for Texas organization promoting Democratic congressman Beto O'Rourke in a challenge to incumbent Republican Senator Ted Cruz in Texas.
In contrast, Cruz has raised approximately $30 million since early 2017 according to FEC filings.
An Ad Archive Report launched online at www.facebook.com/ads/archive/report provided information including numbers of ads and how much money was spent.
Hedge fund billionaire and political activist Tom Steyer spent $1.7 million on Facebook to promote his Need to Impeach campaign, seeking Trump's ouster.
Facebook releases routine reports exposing people behind United States political ads on its platform, the company revealed one of its promise on Tuesday.
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Still, below the campaign chart in fine print is a note that clarifies that the actual top political spender - adding up to more than the spending of the first two combined - is Facebook itself.
Opponents of one of the California ballot measures, Proposition 8, plowed almost $1 million into Facebook ads in an effort to sway the state's voters.
Recently, Facebook said it had removed 68 pages and 43 accounts associated with a Brazilian marketing group, Raposo Fernandes Associados (RFA), for violating the social media network's misrepresentation and spam policies.
Issues of national importance vary, depending on "which country you're planning to run ads related to politics or issues of national importance in", according to the site.
While the sums involved may seem large Facebook's ad revenue as a whole stands at $50bn a year, dwarfing the political contributions.