I usually just use a full-screen editor or get rid of my Internet connection, but if those options are no good for you, you might want to consider finding some software that could only allow access to certain sites or block access to certain sites.

You may also want to use OpenDNS for this. OpenDNS allows you to block sites based on their categories -- such as social networking. When you need to write, you could just go into your OpenDNS settings and block access to social networking sites (or whatever other category).
Source(s):
http://opendns.com

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I just sit down and do it. It's not *that* difficult to go write if you really, really love writing enough to make that your top priority during "writing time."

I also multi-task. Right now, I'm keeping World Series of Poker updates going in one browser tab, which I periodically check, but also doing this and researching for an article that I need to write before the end of the week. When it comes time to actually put the article on computer screen, the other stuff will just fade into the background.
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I don't write when I'm only feeling half-hearted about writing. When I write, I usually blur everything else until there's no idea left in my mind, the flow of thoughts ad ideas just stop. That's when I just listen to music and read online stuffs or simply surf the net, until a new train of ideas come to me.
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