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The US Federal Trade Commission, a consumer and competition watchdog, is investigating Facebook after a major data scandal that affected 50 million users, US media has reported. A probe by the FTC would add further pressure on the social media giant which faces calls by Britain's Parliament and the European Commission for urgent investigations, while US lawmakers have called on Facebook founder Mark Zuckerberg to appear before Congress. At the center of the scandal is a British firm, Cambridge Analytica, which worked for Donald Trump's 2016 presidential campaign.