Devil's Advocate isn't just from some phrase. It's from an actual job. In the debates on the canonization of saints, the duty of the Devil's Advocate was to argue against canonizing that specific person, and to try to uncover anything that may disqualify them from becoming a saint. Generally, however, to be a Devil's Advocate in the common sense is to take a position that you don't agree with simply for the sake of argument. I often like to take a position of the Devil's Advocate in writing, in particular for Odyssey Online, for the same reason.
Usually in writing, and in any art in general, the views expressed in that work is assumed to be the views of the creator or producer of the work. That's why movie and TV producers often put a disclaimer "The views expressed by ____ does not necessarily reflect the views of ___ ..." I choose not to do this whenever I write something that I disagree with or even half-agree with.
Whenever producers and creators put this disclaimer in their work, it creates a disjunction in the mind of the consumer, so that they understand that there is no direct connection between the creators and the product. It's often used whenever controversial images or view are expressed. I choose not to put these disclaimers in because I don't want that disjunction in the mind of the reader. Then why write an article about it? To create doubt and mystery about every article I've written, all the articles I will write, and this article as well. Doubt leads to further examination, and not just acceptance of what is being said because people like clarification.
Do I share the view I am presenting? Am I playing Devil's Advocate? In fact, can you trust the message this article has? Maybe I'm playing Devil's Advocate right now. Maybe I'm not.