I have been getting comment spam so I have had to delete some of the comments on some of my posts.
I have changed my settings to set up obstacles to these so and so people who use blogs for their own purposes. Commenters will have to use word verification to post a comment. This repetition of a randomly generated word requires a human and should stop those who use automatic means to spam the blog. If that doesn't work I will have to switch it to allow only registered users to comment. I have had this problem on my other blogs too and it is extremely annoying.