Blog Spam is the process of dynamically posting comments to blogs that allow user generated content. When the Black hat SEO post these comments he will use a hyperlink in the users name along with the text he wants as the keyword. When this is don’t hundred or even thousands of times it appears to the search engine that a specific url is very popular for a specific keyword. While Google is good at detecting this type of spam Yahoo has had difficulties with it in the past.
Ways to prevent blog Spam
Bad Behavior: A plug in for word press that can detect Blog Spam bots.
Captcha: This requires the user to type in jumbled letters that are not readable by blog spam bots.
Change Field Names: The blog spam bots work because of the comment field inputs have the same name on the default install. If you change the name of the input fields the bots will be unable to submit bad comments.
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