According to this story in Information World, an IBM employee fired for visiting Internet chat rooms during working hours, is now suing the company. He claims that his behaviour was the result of an Internet addiction, and that the company should have offered him counselling rather than sacking him.
There are a few additional elements to the story which you can read at the link if you are interested, but I was struck by the last paragraph:
"In a study released last month, the Stanford University School of Medicine found that one in eight Americans exhibited signs of possible Internet addiction. Dr. Elias Aboujaoude, the study’s lead author, said in a statement, "We need to consider the fact that [the Internet] creates real problems for a subset of people." "