 Well, it's every parent's dilemma. Limiting screen time with your kids. How do you do it? Let's go to the experts. How do the tech giants do it? What are the rules in their house? Well, the CEO of Google lets his kids set their own limits. His kids can decide. That's pretty lenient. In Bill Gates' house, Bill Gates says no smartphones until kids are 14. And Mark Zuckerberg allows his kids to video chat with relatives