I'm raising this question based on the discossion around [these][1] [two][2] questions.  In the second question, the accepted answer references the Pathfinder FAQ, which is not considered RAW by some users.  

The `rules-as-written` tag was edited out of the question, with the justification that the FAQ was not rules as written, and thus the question couldn't actually be asking for a rules as written answer if the accepted answer referenced the FAQ.

With this in mind, what are appropriate sources to use for an answer to a question tagged `rules-as-written`?  I realize that this is going to be different for different systems, but what kind of guidelines should be used to figure out whether a certain source is RAW or not?  Does the opinion of the company publishing the game matter, or the community at large, or just the individual querent?

  [1]: http://rpg.stackexchange.com/questions/36364/is-the-pathfinder-faq-considered-raw
  [2]: http://rpg.stackexchange.com/questions/36325/can-a-spellcaster-use-spell-slots-above-their-normal-limit-if-their-ability-scor