I’m sure I’m saying nothing new, but having FB’d and Twittered for a few weeks, I can see that it can easily drive you into a state of perpetual low-key mania that resembles exhilaration.

It’s (Google)^n. You use your fast-twitch muscles all the time, and God knows what happens to your slow twitch ones. Zadie Smith recently wrote in the NYR of Books that she finally swore off FB, and I can see why.