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This week a former facebook employee gave compelling testimony to a Senate Committee charging Facebooks "advertising-based business model needs to keep people on its platforms for as long as possible, and the company exploits negative emotions to achieve that".

On this Back Story will the revelations achieve change at Facebook and Instagram or are the hurdles to great to police hatred on these enormous social platforms?

Host Dana Lewis interviews Professor Siva Vaidhyanathan the head of Deliberative Media Lab, Media Studies Department, University of Virginia.

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