Facebook's messaging products boss, David Marcus, talks with Recode's Kurt Wagner about how the company is trying turn its Messenger app into a hub for interactions between companies and consumers. Marcus explains what Facebook learned from last year's rollout of "bots" on the platform and why the latest tools are poised to be more useful. He also explains why Facebook is not planning to take a cut of purchases made within Messenger and how it's balancing plans to inject ads into the app with users' privacy.