Anyone who doubts that Internet click fraud has become a big money maker should take a look at a Russian Web site called Robotraff.com, which bills itself as “the first stock exchange of Web traffic.” Set up a free account at Robotraff and you’re ready to buy or sell Web traffic. Got 30,000 hacked personal computers under your thumb? Super! Now you can use those systems to generate a steady income just by pointing them at Web sites requested by a buyer. Or maybe you’re just getting started and you can’t be bothered to build your own army of hacked PCs the old-fashioned way? No problem! Now you can set up a Web site that tries to exploit Web browser or browser plug-in vulnerabilities and simply buy all the traffic you need. So let’s have a look at the transactions Robotraff is handling today: User #704 is selling “search mix”