Facebook CEO Mark Zuckerberg is set to testify before Congress this week, answering questions about user data privacy. The world’s largest social network recently announced that nearly all of its 2 billion users have “likely” had their personal data scraped by third party companies. This follows a slew of bad press about lax privacy protections and Cambridge Analytica, a UK based firm that improperly gained access to user data.

Zuckerberg will appear before the House Commerce Committee and a rare joint hearing before the Senate Judiciary and Commerce Committees. Sen. Richard Blumenthal (D-CT) is a member of both and he says he no longer will “simply trust Facebook.” Soledad O’Brien sits down with him this weekend to discuss potential regulations for social sites.

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