When spammers register on a message board site, they will post advertising links to get their sites picked up on the search engine spiders. This can also be done via signature areas or link reference areas in the profile. The worst of them will flood a site with porn spam. Some will be more surreptitious about it by private messaging or emailing members through the site.
As to how others forward that info to the spammers, I really don't know as it is not something I have ever done myself. I have my suspicions of methods that would work, but not willing to have them grab my own IP address by investigating. And even if I did, I would not want to publicize such methods to give people who might be inclined to engage in that sort of thing a leg up on doing so. But it has happened time and time again when someone gets incensed at a site like this that suddenly the spamming will increase dramatically. Enough so that it cannot be just a coincidence.
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