The link below doesn't technically go to a writing site; however, many of us (okay, not "us" as in including me, but...) also do some artwork as well as writing and this could be important to know. Also, although the perspective is from a visual artist's pov, much of the feeling could also apply to works of fic that have been plagiarized. Please read and get educated about the uses to which some fan art has been put(and be sure you aren't guilty of thoughtlessly contributing to the problem).
http://uglybusiness.livejournal.com/30509.html?view=1478445#t1478445