Referrer Karma seems to be working
Referrer Karma is a little “plugin” for blogs of many flavors. The design is simple, usage requires including a file at the top of your main index page or any other page designed to take comments and adding the check_referrer() function to the top of the page as well. And the logs are filling with unwanted spam that has been turned away 
The main reason for using this plugin – and I quoted that above because it is not a true WordPress plugin by design – is because my referrer logs were filling up with garbage. This is the main goal of the referrer spam; increase the value of their links by hitting a large number of sites who list the referrer somewhere. Once I finally configured it properly it seems to be working rather well. I may make some code modifications so that I can just throw a link to the logs up without having to run redirects through .htaccess and maybe change the resulting links on the log so that they are not “valid” to a search engine…. so far it looks good though. Time will tell if it reduces the junk on my stats page.
Try the plugin on any blog.
