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Massachusetts Sen. Elizabeth Warren, a 2020 Democratic presidential candidate, has openly criticized Facebook, calling it a \"disinformation-for-profit machine.\"

On Oct. 13, Warren continued her campaign against the company by posting false advertisements to Facebook to see if she could prove to voters that the social media platform valued profit over facts.

The ads, publicly sponsored by the Warren campaign, claimed Zuckerberg endorsed President Donald Trump for reelection, showing a photo of Trump and Zuckerberg in the Oval Office. Then the ads immediately take the claim back, ironically slamming Zuckerberg for giving politicians free reign to post false information.

We intentionally made a Facebook ad with false claims and submitted it to Facebook’s ad platform to see if it’d be approved. It got approved quickly and the ad is now running on Facebook. Take a look: pic.twitter.com/7NQyThWHgO

— Elizabeth Warren (@ewarren) October 12, 2019

At the hearing, Zuckerberg defended Facebook's ad policy, explaining that freedom of speech is an important principle of Facebook. He said his decision to not censor ads or political rhetoric could benefit \"challenger candidates, local candidates and advocacy groups whose message may not otherwise be covered by the media.\"

Later in the hearing, Zuckerberg appeared to backtrack on his defense of his company's ad fact-checking policy, saying the policy was \"not about helping the politicians.\"

Rep. Nydia Velazquez, D-N.Y., blatantly accused Zuckerberg of lying about the inability to integrate user data between Facebook and WhatsApp, the messaging service it acquired in 2014.

“Mr. Zuckerberg ... 18 months later ... [the] European Union fined Facebook for providing incorrect or misleading information. So let me ask you, do you understand why this record makes us concerned with Facebook entering the cryptocurrency space? Do you realize that you and Facebook have a credibility issue here?”

Zuckerberg attempted to respond and Velazquez interjected. “Have you learned that you should not lie?,\" she admonished.

”Congresswoman, I would disagree with the characterization,\" Zuckerberg replied.

The Facebook CEO also responded to questions about his company not having anyone doing specific work around civil rights issues.

“Sheryl Sandberg, our COO, is personally leading a civil rights task force that we've formalized inside the company to make sure that we implement suggestions from the audit and to make sure this receives our senior attention,\" he said.

Zuckerberg advised that an independent review of that work will be released publicly.

ABC News' Steff Thomas, Sasha Pezenik and Karma Allen contributed to this report.

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