Fidji Simo, 30
You won’t find video production skills on this French-raised, former eBay strategist’s résumé. Yet Simo heads one of Facebook’s most important features to date, according to her boss, Mark Zuckerberg: live-streaming service Facebook Live. Video has long been huge for Facebook, but Facebook Live started life in 2015 as a promotional tool for celebrities and has evolved into a powerful—and polarizing—spotlight on social crises, capturing several chilling shooting deaths that became news events. Most admires: Bob Iger.