Zuckerberg is testifying in the Senate on Tuesday and the House on Wednesday. He agreed to testify after revelations that Cambridge Analytica, a data-mining firm affiliated with Donald Trump's presidential campaign, gathered personal information from 87 million users to try to influence elections.
Senators are expected to also ask him about Russian interference on his company's platform in the 2016 election.
In testimony released Monday, Zuckerberg apologizes for the privacy scandal and for not recognizing Russian interference sooner.
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