The internet is not something to be addicted to: it's just a hobby. Furthermore, there's more to the internet than chat rooms, gaming, and text-messaging, and those mentioned things are the more involved things to do on the internet. People who are dumb enough to let the internet interfere with their lives can be addicted to basically any hobby, and as such it's stupid to single out the internet as the sole cause.
As mentioned before, if being "addicted" to a hobby is a mental illness, then let's go ahead and throw sports, religion, and music in there too. |