Maybe it'd help to try replacing internet activities with comperable non-internet ones. Like:
Chat/message boards - Spending time with people in person
News/stories/ect - Newspaper/news channel/magazines
Gaming - Console games-especially playing with another person-or any game/try a new hobby
Shopping/"window" shopping - Get someone and go out for it

And try filling your time with other things - especially time commitments, while it's easy enough to put off a new hobby and get online, something with a specific time pushes you a bit more to do it instead. Ex. volunteering - esp. with a people group you relate to or care about, Curves-like-thing(I think they go by appointment times), planned events with friends, a class, groups within the community - interest, religious, activist, hobby.
Or try picking up something you used to do, and maybe go somewhere outside your home so the internet isn't there to distract you, like a park, bookstore, library, coffeehouse, friend's place and get them to join you.

Personally, I tend to turn to the internet when I don't feel like some need is met outside of it - usually relationship-wise. Or boredom. But some of the stuff I've listed helps sometimes, it's worth a try anyway.