Andy Stumpf has three kids. His middle son downloads Instagram once a week for memes then deletes it. His oldest is approaching the point of mildly mocking heavy users. His daughter is surgically attached to her phone. His theory: the generation coming up is starting to view these platforms with a wary eye, and just like anti-smoking campaigns failed until they exposed the tobacco industry's manipulation, the platform rebellion will come when young people realize they're being played.