Susan Wojcicki talks to Peter Kafka at Code Conference, defending YouTube’s controversial decision not to ban Steven Crowder for slurs against journalist Carlos Maza. She talks about YouTube's use of humans, software and rules to police the videos its 2 billion users upload, and says the company is improving its ability to remove objectionable content. After a 30 minute on-stage interview, Wojcicki answers more questions from the Code audience. 

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