Fake the referrer - open to bidding

Faking The Referrer For the past couple of years, I have seen a few websites appear that provide the service of "faking the referrer" when delivering traffic. These companies have the ability to deliver traffic to various URLs and make the referrer say almost whatever they want. They can make traffic appear in Google Analytics as if it's coming from [login to view URL] for any keyword, or from Twitter, Facebook, Tumblr, etc. One recent company I came across that can do this is: [login to view URL] Please review that website and learn what they can provide. Their service comes from a machine that automatically delivers everything, so none of the traffic is real. I would like to have this technology to run a very similar business. If you know how to do this, but that job would include a similar website to [login to view URL] and an Administrator's area. Please confirm if you have fully reviewed the task and if you do know how to fake the referrer, so I can offer a service just like www.fakethereferrer.com. They are able to send traffic to any URL and make that URL think the traffic came from a specific location, such as a search term in Google or Twitter, when in reality it came from their bot system. Here is an example of their live traffic statistics, which is a demonstration of how powerful their service is: [login to view URL] For this job, beyond the programming, would I require a proxy service? To be built on php ,mysql