“Every generation of teenagers has figured out a way of rebelling against their parents, or giving it back to ‘the man.’ What I think is unprecedented is the very ‘man’ and the system they want to rebel against can track them and find their digital footprints online,” Mr. Balkam says. “In a sense, it’s good that we can catch kids who are getting radicalized sooner than later, but by the same token, it’s a challenge for kids to grow and develop, which is their job as a teenager, if they are being scrutinized too much.”