“Every blogger should also have a Terms of Use page that outlines what you do and do not find acceptable. Then you can enforce at will.”

While it’s an interesting comment that John P. makes, it starts from an invalid assumption – that people have some sort of right to comment on your blog. No one does. If you have a blog, and especially if you pay for it, it’s yours. You don’t have to allow any commenting if you don’t feel like it. And you can moderate, delete, hey, you can edit people’s comments, and they have no recourse, and nothing to say about it (other than posting about you elsewhere should they so desire). While I know it’s customary to allow blog comments, the belief that somehow people have an inalienable right to post them is nonsense.