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No Follow, rel="nofollow" & Robots.txt

Preventing comment spam on your blogging pages can be a hard task. However there is a way to prevent the spammers from benifiting by all the comment spam. You can simply include rel="nofollow" to all comment links.

Example: Visit my <a href="http://www.example.com/" rel="nofollow">some generic spam</a> site

ref: http://googleblog.blogspot.com/2005/01/preventing-comment-spam.html

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