Facebook founder admits 'mistakes' over Cambridge Analytica

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Zuckerberg to make it harder for app developers to harvest information in future. We hear from an early investor in Facebook and mentor to Mr Zuckerberg. Also in the programme: over 100 girls abducted by Boko Haram in Nigeria come home And a silent movie that predicted the Nazis is found and restored. (Photo: Mark Zuckerberg speaking at Facebook headquarters. Credit: EPA/PETER DASILVA).