In this post, I’ll explain how to reduce the amount of comment spam your WordPress blog receives by using an unobtrusive ‘handshake’ between the two files necessary for a valid comment submission to take place. I’ve written a few different articles on reducing comment spam by means of a challenge response test that the [...]

Comment spam comes from humans who are paid to post it and robots/scripts that do it automatically. The majority of spam comes from the bots. There’s very little one can do to defend against a determined human being, but bots tend to behave predictably, and that allows us to develop countermeasures.
From my observations, [...]