Unplugging

I follow a number of writers on various online media, and I'm always surprised when I read a post that seems to have been posted in the middle of a writing session. How is this possible, I think. I've written one complete novel and three incomplete novels, and all of them were written as I sat in silence. No phone. No people. No internet. I worked at a publishing company for nearly three years, and I had at least one colleague who had a movie up on his/her screen almost always. She/He was supposedly editing while he/she watched movies. Is this possible? Even when I'm doing publicist work, searching out blogs, trying to "meet" people who would be a good fit for my author, I am so easily distracted. I have to shut every window on my computer, or else I find myself stopping and checking them constantly, and then I've lost the flow. When you're writing, editing, reading, etc., do you unplug? And if not, are you actually getting writing, editing, reading, etc., accomplished?