Election misinformation reached a new low with Donald Trump peddling a fake story that immigrants are eating pets in Ohio on the debate stage. But how does this kind of fake news come about? How much can we attribute to foreign interference, and how much is homegrown bullshit? Social media disinformation expert Renée DiResta joins David Rothkopf and Rosa Brooks to discuss where these lies come from, how they spread, and what you can do to separate fact from fiction. 

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