A buddy of mine left his WordPress blog unattended for several months because he wasn’t publishing new content at the time nor was he monitoring the comments. Unfortunately, his blog didn’t have a Disqus or Facebook comment system in place and he failed to include a spam filter such as Akismet with his current comment system. The result: thousands and thousands of spam comments flooded his blog posts.
At the time of this writing, WordPress doesn’t have a way for the user to send spam comments to the trash with a single click. I’m sure that feature will be added in the future, perhaps an “Empty Spam” button similar to the “Empty Trash” button, but for now the user must either manually select each spam comment and send it to the trash or install a plugin that will do the trick. Clearly the former option isn’t going to work well for anyone and sometimes installing a plugin reduces the speed of the WordPress blog.