Inside the business of Bon Appétit's wildly popular YouTube channel, which has made editors like Claire Saffitz into social-media stars

· Condé Nast has found viral success on YouTube by turning some of the editors and chefs behind Bon Appétit magazine into social-media stars. 
· Bon Appétit's YouTube channel has 5 million subscribers and its most popular show, "Gourmet Makes," averages between 3 million and 5 million views an episode. 
· Business...