Did Donald's Data Trump Hillary?

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How data science helped Donald Trump's campaign to zero in on those voters who mattered the most. Plus, is social media to blame for so-called "post-truth" politics? And how Tanzania is using mobile phones to register newborn babies. Presented by Rory Cellan-Jones, with special guest Alison Van Diggelen, journalist specialising in green technology, and Chris Foxx from the BBC online tech desk. (Image: US President-elect Donald Trump on election night, Credit: AFP).