Del Harvey is the VP of Trust & Safety at Twitter. She works to ensure user safety and security, balancing Twitter's wide-open spaces against spammers, harassers and worse, to create a workable policy that lets the tweets flow. Prior to joining the booming social media site, she spent five years as the law enforcement liaison for a group fighting child exploitation, where she worked withagencies ranging from local police departments to the FBI, US Marshals and the Secret Service.

As Twitter grows, its ever inventive users (who famously came up with many of its key features by themselves) are finding ever new ways to overshare, offend and pick on others. Harvey and team's challenge is to weed out the worst while keeping the site feeling like a safe place to have this new kind of conversation we're all having there now.

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