I know to argue against our online lives seems like the argument of the grumpy, old Luddite novelist, but I really always try to make the argument from the perspective of personal pleasure.
I guess I've always written more from the opposite perspective, that kind of existentialist perspective which argues that existence precedes essence. And there really isn't anything essential in there - you're the product of your actions, which can always change. And they retrospectively make you one way or another.
