aristotle - 3:50 pm on Oct 27, 2012 (gmt 0)
I'm finally ready to upload a disavow file, but I'm not sure about one point: Should this file be uploaded twice, once to the www version of the site, and once to the non-www version. Both of these have been verified in GWT.
I've re-read the Google webmaster central blog, and done some web searches, but haven't found a definitive answer. So I'm hoping that someone here will know.