Why Knuth stopped using email

Heh, and email was just the beginning... If he can't stand email I wonder how would he react to even more distracting things such as IM, Facebook, Twitter.

What is greatness, you ask? It is the ability of a man to stand on his own, against the whole world, against the very flow of time itself:

Email is a wonderful thing for people whose role in life is to be on top of things. But not for me; my role is to be on the bottom of things. What I do takes long hours of studying and uninterruptible concentration.

Same reason I quit using email.