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Illustration: Sarah Grillo/Axios

Mark Zuckerberg's Senate testimony included few revelations, and he often had to explain the mechanics of Facebook's platform in answering lawmakers' questions — so there was plenty of ground that Zuckerberg was able to avoid.

Our take: The majority of the 44 lawmakers questioning Zuckerberg in the joint Senate hearing were not well versed in the workings of Facebook or how data is shared between platforms, developers and advertisers. The questions generally focused on what Facebook was capable of doing, allowing Zuckerberg to stay in a safe zone of providing the basics.

What we learned: Facebook's CEO said he'd handle the Cambridge Analytica data leak differently if he had a do-over, confirmed Facebook staffers are cooperating with Special Counsel Robert Mueller's team, affirmed he'd "welcome the right regulation," and (unsurprisingly) asserted that he doesn't think Facebook is a monopoly.

What we didn't learn: Here are the questions that remain unanswered.

Exactly what kind of privacy regulation is Facebook open to?

  • Zuckerberg carefully avoided committing to any specific privacy rules. He did offer some vague suggestions, like requiring simpler language to explain how data is used, but didn't get into specifics.
  • He said an "opt-in" requirement (i.e., Facebook would have to get users' consent before sharing their data) "makes sense to discuss," but added that "the details around this matter a lot."
  • He said web platforms like Facebook shouldn't be subject to the same rules as the "pipes" run by internet service providers. "In general, the expectations people have for the pipes are different than for the platform."
  • He said a potential rule of notifying affected users within 72 hours of a breach "makes sense to me." (Key distinction: Facebook says the Cambridge Analytica situation was not a data breach.)

Will Facebook truly be able to monitor the troves of content on its site for harmful material and misinformation?

  • Zuckerberg said the safety monitoring team would be expanded to 20,000 people, and artificial intelligence would help weed out fake news.
  • But he was unable to guarantee that, for example, the site was free from propaganda such as material Russians placed during the 2016 election. "As long as there are people sitting in Russia whose job it is to interfere with elections around the world, this is going to be an ongoing conflict."

Has Facebook removed left-leaning groups or pages from the site?

  • Sen. Ted Cruz peppered him with questions about Facebook's role in political speech and asked if Facebook has removed pages or content from left-leaning groups the way it previously removed some right-leaning pages.
  • Zuckerberg said he was "not aware" of such instances but assured Cruz that content takedowns had not happened because of an employee's political views. He also insisted a job candidates' political leanings don't matter during the hiring process.

How long does Facebook store data after a user deletes their profile?

  • Zuckerberg said he wasn't sure and would ask his team to get back to the committee.

When did he personally first find out about Cambridge Analytica's inappropriate data use?

  • Facebook discovered that the firm had the data in December 2015. But it is unclear if Zuckerberg personally knew anything earlier than that, or exactly how Zuckerberg was informed of the breach.

Should Facebook allow users to be paid for data?

  • Zuckerberg was asked by Sen. Ron Johnson about ideas to let users monetize their own data. "I’m not sure exactly how it would work to be monetized by the person directly," he said, adding that an ad-supported business model was the best one for the company.

What's next: Zuckerberg testifies in the House Wednesday morning, where members have the chance to revisit questions. But so far, Zuckerberg has emerged mostly unscathed.

Go deeper

Updated 3 hours ago - World

In photos: Pope Francis spreads message of peace on first trip to Iraq

Pope Francis waving as he arrives near the ruins of the Syriac Catholic Church of the Immaculate Conception (al-Tahira-l-Kubra), in the old city of Iraq's northern Mosul on March 7. Photo: Vincenzo Pinto/AFP via Getty Images

Pope Francis was on Sunday visiting areas of northern Iraq once held by Islamic State militants.

Why it matters: This is the first-ever papal trip to Iraq. The purpose of Francis' four-day visit is largely intended to reassure the country's Christian minority, who were violently persecuted by ISIS, which controlled the region from 2014-2017.

Cuomo faces fresh misconduct allegations from former aides

New York Gov. Andrew Cuomo during a February press conference in New York City. Photo: Seth Wenig/Pool/AFP via Getty Images

The office of New York Gov. Andrew Cuomo (D) was on Saturday facing fresh accusations of misconduct against his staff, including further allegations of inappropriate behavior against two more women. His office denies the claims.

Driving the news: The Washington Post reported Cuomo allegedly embraced an aide when he led the U.S. Department of Housing and Urban Development and that two male staffers who worked for him in the governor's office accused him of routinely berating them "with explicit language."

In photos: Protesters rally for George Floyd ahead of Derek Chauvin's trial

Chaz Neal, a Redwing community activist, outside the Minnesota Governor's residence during a protest in support of George Floyd in St.Paul, Minnesota, on March 6. Photo: Kerem Yucel/AFP via Getty Images

Dozens of protesters were rallying outside the Minnesota governor's mansion in St Paul Saturday, urging justice for George Floyd ahead of former Minneapolis police officer Derek Chauvin's trial over the 46-year-old's death.

The big picture: Chauvin faces charges for second-degree murder and manslaughter over Floyd's death last May, which ignited massive nationwide and global protests against racism and for police reform. His trial is due to start this Monday, with jury selection procedures.