"What Zuckerberg "has" done is given Donald Trump free rein to lie on his platform - and then to pay Facebook gobs of money to push out their lies to American voters", Warren said in the ad. "But Facebook just cashes Trump's checks".
Warren says her campaign created the intentionally false ad to test the company's platform and that it "got approved quickly". "They've chose to let political figures lie to you-even about Facebook itself-while their executives and their investors get even richer off the ads containing these lies".
The Massachusetts Democrat, who is now the frontrunner in her party's 2020 presidential primary, took to Twitter Saturday to share her campaign's Facebook ad that aims to draw attention to the social media giant's policy, which Warren sees as a threat to democracy.
Warren's campaign sponsored the posts which were blasted into the feeds of USA users of the social network, as it pushed back against Facebook's policy to exempt politicians' ads from its third-party fact-checking program.
She went on to claim that Trump's campaign spent $1 million per week on Facebook ads, allegedly including some that wouldn't air on television because they contained false claims. "Now, they've changed their policy so they can profit from lies to the American people", she said before linking to a petition calling for Zuckerberg to be held "accountable".
"Facebook believes political speech should be protected", Andy Stone, a Facebook spokesperson, told Boston.com in a statement.
While some TV networks have recently refused to run Trump ads with demonstrable inaccuracies, Facebook says it "not our role to intervene when politicians speak", according to Nick Clegg, the company's vice president of global affairs and communications.
Warren's stunt came as Facebook faced criticism from conservatives and progressives alike. "It is unacceptable for any social media company to knowingly allow deliberately misleading material to corrupt its platform".
The Warren campaign ads, some of which feature a photo of Zuckerberg and President Trump together, link to a petition supporting her plan to break up major tech companies such as Facebook, Alphabet Inc's Google and Amazon.com Inc, on antitrust grounds.
Facebook issued a statement in response to the move, saying it will protect free speech. "Once again, we're seeing Facebook throw its hands up to battling misinformation in the political discourse, because when profit comes up against protecting democracy, Facebook chooses profit".
Progressives, like Warren, have warned that Facebook could easily be leveraged to help Republicans win re-election.
At the time, Tim Murtaugh, a spokesman for Trump's campaign, said the ads were accurate.