There is what seems like a thousand plugins available to reduce comment spam from appearing on our blogs. If any single plugin worked, why would there be so many different ones, each attacking comment spam in a different way?
As I remarked in "Four Ways to Provide Convenience to Your Readers", a post at The Reader Appreciation Project, commenters go for the path of least resistance.
What comment reduction methods create resistance to real comments? Any form of CAPTCHA, including math problems. Anything that slows the commenting process down is resistance. Many potential commenters will choose not to comment rather than go through any process other than a normal form-filling process. Even though we don't want to discourage comments, we still have to do something about the comment spam.
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