Mark Zuckerberg is scheduled to appear before a joint hearing of the Senate Judiciary and Commerce Committees today.The hearing will focus on the use of and protection of Facebook user data.

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The public grilling, coming in the wake of the Cambridge Analytica scandal, could be a turning point for the social media behemoth and its young founder, which has largely avoided government regulation in its 15-year existence.

On Monday, the House Committee on Energy and Commerce posted Zuckerberg’s prepared testimony, in which the 33-year-old billionaire said his company needed to do more to protect the privacy of its users.

“We didn’t take a broad enough view of our responsibility and that was a big mistake,” Zuckerberg said in the testimony. “It was my mistake, and I’m sorry. I started Facebook. I run it, and I’m responsible for what happens here.”

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