Is there a way to report spam?
Looks to me like one "review" here might qualify as spam:
https://www.ohloh.net/p/gimp/reviews
A bit offtopic:
They're also password-protecting and selling GFDL-licensed text; IANAL so I can't tell if that's legal. I do believe at least one provision is probably violated, 4. I:
Preserve the section Entitled "History", Preserve its Title, and add to it an item stating at least the title, year, new authors, and publisher of the Modified Version as given on the Title Page. If there is no section Entitled "History" in the Document, create one stating the title, year, authors, and publisher of the Document as given on its Title Page, then add an item describing the Modified Version as stated in the previous sentence.
Observe their Table of Contents.
http://www.welloiledpc.com/Reports/GIMP%202.6%20User%20Manual%20ToC.pdf
Not having history is probably important, since they "corrected" some stuff. Also, they're not including GFDL with the "sample chapter" (section 6 of GFDL).
Again, IANAL, but this seems like it might be GFDL violation, and an advertisement, masquerading as a review.