Comment spam needs no introduction and so does a comment spammer. A comment spammer is a person or a software program (bot) whose main purpose is to fill your blog with rubbish with the sole aim of getting either a link juice or to spread the word by promoting something in this stupid manner. It is one of the nasty things, one nuisance bloggers frequently encounter. Popular Blogs get hundreds of comments everyday and managing comments and filtering spam soon becomes a headache if no antispam measures have been put in place.