A novelist acquaintance told me how chagrined she was by her capacity to procrastinate online in lieu of working on her next book. (Join us, do.) After spending an entire afternoon on Instagram, to the point where she’d seen every last post on her timeline, she was gripped by the sudden fear that one day she’d arrive at a point where there was nothing more to see. The message on her phone would simply say, “That’s it. You’re done. You’ve reached the end of the Internet.” I mentioned this to one of my children and he said, “That joke is everywhere.”