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Like most bloggers, I see a fair share of comment spam. This used to be a problem, as I didn’t have a good way of filtering them out, meaning I set the comment option to Approve all. After I moved from Blogger to WordPress, I was tipped off about a plugin called Akismet.
The lovely thing about it is that it checks incoming comments against a blacklist created by the entire community of people using Akismet, meaning that, whenever someone marks something as spam, the central blacklist is updated. Having run on WordPress for three months, the current tally is 668 spam comments caught, six false positives, and one spam comment not caught.
Akismet is simple, quick to set up, and, most importantly, it just works.