Del Harvey: The strangeness of scale at Twitter

When hundreds of thousands of tweets are fired every second, a one-in-a-million chance — including unlikely-sounding scenarios that could harm users — happens about 500 times a day. For Del Harvey, who heads Twitter’s Trust and Safety Team, these odds aren’t good. The security maven spends her days thinking about how to prevent worst-case scenarios while giving voice to people around the globe. With deadpan humor, she offers a window into how she keeps 240 million users safe.