Facebook says the personal data of up to 87 million users may have been improperly shared with a British political consultancy firm, 37 million more than previously thought.
Last month it was revealed that the users' information was obtained by the firm Cambridge Analytica, which worked for Donald Trump's presidential campaign.
Facebook chief executive, Mark Zuckerberg, says he is committed to restoring Facebook's reputation.
Al Jazeera's Alan Fisher reports from Washington.
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