I've been noticing this type of activity on my user-content sites for a couple years now. It'll make it past any human-detection script you throw at it, and it

I've been noticing this type of activity on my user-content sites for a couple years now. It'll make it past any human-detection script you throw at it, and it seemingly doesn't care that 99% of it gets blocked by bayesian filters and would have no-follow links on no-index pages even if it made it through. The only effective solution to human-powered spam is to flip your user-generated content from "public by default" to "probably spam unless proven otherwise by a moderator". Watch your users posting things, approve the non-spam to be publicly visible, mark consistently good users as "trusted" so that you don't have to watch them anymore. It takes more human intervention, but really that's the only way to make a user-generated content site work these days. (Unless, of course, your userbase is an army of geeks who are willing to upvote good stuff and flag spam for you). More here: http://expatsoftware.com/articles/2010/03/care-and-feeding-of-happy-spammer.html http://expatsoftware.com/articles/2010/03/care-and-feeding-o...