Now that every1 has tasted the fruits of comment spam on their blogs, the google consortium has come up with solution to curb the pain in our blogs.

This isn't a negative vote for the site where the comment was posted; it's just a way to make sure that spammers get no benefit from abusing public areas like blog comments, trackbacks, and referrer lists.

In brief the blogs app manufacturers will create links with use of the nofollow attrib in your markups which the indexing engines will ignore to give spam robs Zero benefit of their efforts.