Facebook CEO Mark Zuckerberg is on Capitol Hill testifying before Congress.
READ: Zuckerberg's full transcript
Zuckerberg will spend two days answering lawmakers' questions about the powerful social network he helped create more than a decade ago, and whether the company is doing enough to protect users' privacy.
It's the first time Zuckerberg will personally sit for questions from Congress, instead of sending a deputy.
His testimony marks a pivotal moment for Facebook and the tech industry.
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