I do enjoy the idea of a world end as propagated by the American movies: that without electricity and Internet, they're going back to the stone age... (Because, you know, that's when electricity's been invented and America discovered), which follows when you take electronics away from the teenager. They don't know where their friends live without their phones and FB, they don't know how to contact them or their teachers without Internet, they don't know how to find them, they don't even know where to start looking. Stand on the street and hope someone familiar walks by?