How does he manage without twitter/facebook/reddit ?

From what I understand, it's to improve productivity.  He has not used email since 1990, after
using it for fifteen years.  On his web page, he wrote that he does his work in "batch mode",
and responds to correspondence the same way.  So I'd gather he doesn't use a net-connected
computer because it limits distractions and lets him do things in batches.