The social-media giant has manifested its final form: not digital connector, but digital bazaar.Illustration by The Atlantic. Source: Getty.This is an edition of The Atlantic Daily, a newsletter that guides you through the biggest stories of the day, helps you discover new ideas, and recommends the best in culture. Sign up for it here.I was recently surprised to learn that my wife is still on Facebook. “I’m not,” she replied. “I’m on Facebook Marketplace.”Facebook Marketplace has emerged as a ma...