I'd say that online friendships are sometimes as real to the extent of real relationships. There are some people online that matter to me as much as people in real life. Hell, the death of an online friend's pet got to me as much as when one of mine died.
She should be happy that you're on JoeUser. There are much worse places to be online. In fact, I'd say that JoeUser has much less drama and immaturity than most other places I know.
As long as you handle your responsibilities and maintain some sort of life outside the Internet though, I'd say you're not spending too much time online.
