I disagree that turning off the computer will beat SA. For some people the internet can provide critical support they need. It can often the only way that they can comfortably reach out to find help.
I find that the internet can be very helpful, a way of reaching out to the world. You can network with people via blogs, facebook and forums. I think that this is hugely beneficial.
I use my home computer a lot, in many constructive ways. Of course the internet can be a blessing but also a curse depending on how you use it.
I have raised money for charity through the computer, I have kept a blog that helps and inspires people recovering from knee pain. I have made friends on facebook and forums with people who share my passion- running. I enter races on my computer, book travel and accomodation for my running adventures. There are the results and photos of my races on the internet. My photos of wildflowers, and my short stories are published on the internet. I can edit and store my photos on my computer, and look at them to bring me joy.
The OP presumes that visitors to these forums do not get out into the world.
In my case, I get out and run 40 miles a week, I run in races with thousands of people, I mix with a local running community. Even though I find this difficult I still put myself out into the world, sometimes a great risk to my emotional well being.
I'm also a botanist, and I get out into nature and survey plants, sometimes with people I am unfamiliar with.
I am very active and have achieved alot both using my computer andout in the real world despite my anxiety.