In Lorelle’s blog, she explains why we should not delete comment spam that plagues our forums and blogs but rather we should mark each spam comment as spam so that Askimet can filter it out in the future.
Originally posted on Lorelle on WordPress:
I’ve been speaking at a variety of meetups lately on web publishing, blogging, and podcasting, and the topics often turn to managing comments and comment spam. “I’ve started getting a lot of porn comments lately.” “I’m so sick of all those credit card spammers.” “I spend too much time and energy on comment spam, I just don’t know what to do.” “I seem to spend all my time deleting comment spam and it just keeps coming back.”
My answer is always the same: Use the Akismet WordPress Plugin on WordPress, Movable Type, Drupal, phpBB, Joomla, and other web publishing platforms. Mark comment spam as spam and do not delete it to help Akismet do its job.