Emerson Spartz is one of the world's leading experts on internet virality. He got his start at age 12, as the founder of MuggleNet, a Harry Potter fan site. Now 27, he's the CEO of Spartz Media, which says it is one of the fastest-growing digital media publishers with 160 million page views per month. We'll talk to him about the secrets of virality, the eternal tension between virality and journalism, and the future of content.

Plus, we'll tell you what to think about Microsoft's Windows 10 announcement, the latest antics from T-Mobile CEO John Legere, and the coming year in health gadgets.