The 20-year-old woman was found by police lying shaking in undergrowth after she was raped in the city on 3 August 2008.
Almost 6,000 people have joined the appeal group on the social networking site since the 27-year-old launched it.
A police spokesman said it "supports the essence" of the Facebook campaign.
Since the attack the force has issued four appeals including CCTV images of a man they want to speak to, but eight months on nobody has been arrested.
Det Insp Mick Montford said: "We looked through dozens of hours of CCTV images with the victim.
"I'm aware of the Facebook appeal, and this is something we are monitoring closely."