Why I'm quitting Facebook

Editor's note: Douglas Rushkoff writes a regular column for CNN.com. He is a media theorist and the author of the upcoming book "Present Shock: When Everything Happens Now." (CNN) -- I used to be able to justify using Facebook as a cost of doing business. As a writer and sometime activist who needs to promote my books and articles and occasionally rally people to one cause or another, I found Facebook fast and convenient.

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