I see spam submissions occasionally on my blog and online forums. Why aren't there any on Stack Overflow?
What does SO use for spam filtering?
(I have been here for a year and haven't seen a single piece of spam.)
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There are active SPAM detection measures in the SO stack, and, as others have noted the SPAM that makes it through is dealt with quickly by the SO community. I'd also like to think that SPAMmers have figured out that we're a community that doesn't respond to their techniques, but I think that would be giving them too much credit.
It's also possible that
Chuck Norris Jon Skeet keeps them at bay, though that reasoning is highly suspect because if he were to try, they would never succeed in getting through.
I've seen spam once or twice in 4 months. It's rare because spammers don't build up reputation, and that's because spammers only really know how to spam. That in turn means that all spam ends up being effectively flagged on the front page as a significant change (because it's got to be a question or answer) and the large community then spots it and flags it, and a suitably-empowered person deletes it.
Is SO spam-proof? I don't think so. (I've thought of a way of getting around the defenses while writing this answer for example.) But it's a very hard target as there are barriers to entry that keep genuine riff-raff out. Much easier to pick a target with a better risk/reward ratio like Wikipedia…