Watch: Key moments from day 2 of Mark Zuckerberg's Congress grilling

Facebook CEO Mark Zuckerberg on Wednesday sparred with US lawmakers over how much control users of the world's largest social media network have over their data in a sometimes fractious five-hour hearing. He assured members of the House of Representatives Energy and Commerce Committee that users have ultimate control of their Facebook information, but undermined that by saying he was among the 87 million users whose data was improperly shared with political consultancy Cambridge Analytica. Here are some key moments from the second day of Zuckerberg's testimony on Capitol Hill. (Text: Reuters)
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