Is there really such a disorder as “Internet addiction”? In my estimation, the short, honest answer is, “We don’t know enough to say for sure.” Part of the problem is the ambiguity in—and disagreement over—the terms “addicted” and “addiction.” An even more serious problem is sorting out the role of “the Internet” (and other electronic media) from the role of underlying emotional problems or psychiatric disorders that may better explain the so-called addictive behavior.

via Is it possible to have Internet addiction?.