There really is such a thing as Internet Addiction. It seems as though Chinese doctors have been able to classify symptoms and have been able to cure some 80% of all internet addicted victims.

Doctor Tao Ran, who treats sufferers at Beijing's Military General Hospital, says the threshold is around six hours a day and one of the following symptoms in the past three months: "yearning to get back online, mental or physical distress, irritation and difficulty concentrating or sleeping."

For more info, Check Lifehacker.