The cool thing when you want to test a few lines of codes against spammers is that you don't have to wait too long to see how things goes.
I'm currently fine tuning a new anti referrer spam that has some very cool features, and since I've activated it, 40 hours ago now, it's already been through 5248 spam attempts. So far, 100% were blocked, there has been no false positive, and my referral log is cleaner than ever.
The best part is : I've basically shrunk things to one test that is enough to block all attempts, and this script will require no (or uber minimalissima) maintenance (no data or IP list or anything to keep up to date)
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