The New York Times covers Korean boot camps designed to combat web obsession, aimed at those whose usage of the web borders on addiction. Here are the alleged signs of such addiction:
[An] inability to stop themselves from using computers, rising levels of tolerance that drive them to seek ever longer sessions online, and withdrawal symptoms like anger and craving when prevented from logging on.
That sounds like a web worker I know. Fortunately, no one has ever died from exhaustion due to making too many VoIP calls in one sitting.