"Internet Addiction Disorder." According to Wikipedia, "IAD was originally proposed as a disorder in a satirical hoax by Ivan Goldberg, M.D., in 1995. He took pathological gambling as diagnosed by the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) as his model for the description of IAD. However, IAD receives coverage in the press, and its classification as a psychological disorder is being debated and researched."
In China, it is considered to be an epidemic. Last year China estimated that of the country's 40 million underage Internet users, some 10% were "addicted" to the Web. Surveys discovered that about 42% of these kids said they felt "addicted" while only 18% of US children felt similarly.