Snow Crash - Neal Stephenson

"This Snow Crash thing--is it a virus, a drug, or a religion?"Juanita shrugs. "What's the difference?"The only relief from the sea of logos is within the well-guarded borders of the Burbclaves. Is it any wonder that most sane folks have forsaken the real world and chosen to live in the computer-generated universe of virtual reality?In a major city, the size of a dozen Manhattans, is a domain of pleasures limited only by the imagination.

But now a strange new computer virus called Snow Crash is striking down hackers everywhere, leaving an unlikely young pizza delivery man as humankind's last best hope.