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What Cambridge Analytica and Facebook tell us about how our data is used. Manuela Saragosa speaks to Tijmen Schep, a Dutch technology critic and author of a book called Design My Privacy, about the realities of the data economy, and to Paul-Olivier Dehaye, co-founder of a Swiss start-up called PersonalData.IO, which helps people reclaim their data from companies like Tinder. And US tech journalist Ben Tarnoff discusses the prospect of tighter regulation on the way tech firms like Facebook use the information they have on their users. (Photo: A collage of profile pictures at a Facebook data centre in North Carolina, Credit: Getty Images)