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How bots and fake accounts work

Data: Imperva Incapsula Bot Traffic Report. Based on 16.7+ billion visits to 100,000 randomly-selected domains on the Incapsula network; Chart: Lazaro Gamio / Axios

What's the difference between "good" bots and "bad" bots? And why doesn't Snapchat have a fake news problem? Here's a quick guide to some of the discussions that might come up during the hearings this week.