Dr Dave’s Referrer Karma is about the most useful anti-referrer spam tool I have seen so far. No more fiddling with .htaccess, no more redirecting spammers to their own pages. This simple php script keeps blacklists and whitelists, bans spammers when they are hitting your page too often, it also checks the reffererring URL for some indication of your site’s URL or even if it exists. For me it has reduced the referrer Spam I am getting to almost nothing at all - down from up to hundreds per day.
If you are looking for one simple solution - this is it. You only need MySQL as well as PHP - and off you go. Wrongfully detected “real surfers” are not blocked out but just sent to a page where they are told about the problem and then can access the site after a mouseclick.
Rating: 10/10.
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