These are all very thoughtful and challenging questions. I would recommend you check out a new podcast series, Their Own Devices.
Description
No matter how tech savvy you are, your kids likely have you beat. Digital natives see the world in a fundamentally different way than all previous generations. This makes 21st century parenting an unprecedented challenge. Join Marc Groman, an Obama White House tech and privacy adviser, and David Reitman, an adolescent medical doctor, for candid discussions and helpful tips about screen time, social media, sexting, privacy, online gaming, and other challenges facing parents today.
https://itunes.apple.com/us/podcast/their-own-devices/id1441131937?mt=2