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Originally Posted by Artashes
Peter, forum spam is more complicated these days as spammers hide behind 1, sometimes 2 proxy servers - makes it difficult to track down.
In my books, they do not do it for traffic, rather for search engine rankings for certain keywords, in hopes not all forums will notice. With a recent boost in free board hosting services, there are hundreds of thousands of forums that are installed but not active.
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I don't know of too many hacks that are that great at preventing forum spam, but I have found that some mod_security tricks work really well. I recommend checking out the rule sets at
http://www.gotroot.com/. Their Bad UserAgents blocking, Comment spam blacklist, Compromised/Hacker boxes blacklist all have worked pretty well at blocking forum spammers for me, since most are simple bots scouring the internet.