Recently my MKTG 470 students have been asking how to reduce the number of requests for irrelevant (a.k.a. spammy) comments on their blog. Now that their websites have been active for a few weeks, spammers are attempting to use their blogs as a means to advertise their assorted products.
The easiest workaround is a CAPTCHA. A CAPTCHA provides a means to determine if a commenter is a person instead of a computer.
Try this exercise to install a CAPTCHA in WordPress. My favorite is SI CAPTCHA Anti-Spam, but I would love your feedback on other CAPTCHAs or other tools to reduce the spammy comment attempts on blog posts.