Lately, it seems that more and more spammers are using comments on blogs to attempt to advertise their websites or whatever. The usual comment I get is from a specific business saying something vague such as "Oh, I really love your blog. Please keep writing such interesting and helpful blog posts. ABC Company website reference." This kind of stuff is why they developed the delete key.
If you want your comment to survive my delete key, I suggest you make a specific comment about the content of the blog you choose for your message. Otherwise, I will continue to delete messages that are intentionally vague and do not refer to any of the content of the blog posts. I suggest we all do the same thing. Please do not get me wrong. I love good, pertinent comments. I do not like spam.