Privacy law in the U.S. has one clear line: Treat everyone 12 and under as kids, and everyone 13 and older as adults -- at least when it comes to the online world. The core privacy law around kids using digital services was written in 1998 when the Internet was very different. It's been updated once, but the protections for kids are still limited and the rules are confusing. How did we get here? And what do we need to re-think when it comes to the safety and privacy of teens on the modern, more mobile Internet? Marc and David sit down with Phyllis Marcus, a leading expert in privacy, advertising, and digital tech issues as they relate to children. She's also the mom of three, who gets our frustrations.