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What's at stake for Facebook and its founder? We get reaction to Mark Zuckerberg's testimony in front of Congress from investigative journalist Sarah Lacey in Silicon Valley and UK journalist Carole Cadwalladr of the Observer. Ed Butler also speaks to Facebook co-founder Chris Hughes about what the social media giant should do next, and Shoshana Zuboff, author of The Age of Surveillance Capitalism, makes the case for sweeping change. Plus privacy consultant Dylan Curran takes a trawl through all the data Facebook and Google have on him. (Photo: Facebook CEO Mark Zuckerberg testifies at joint senate commerce/judiciary hearing, Credit: Getty Images)