Originally posted by Kevin Graeme to the CF-Community list.
-----Original Message-----
If you're a blogger (or a blog reader), you're painfully familiar with
people who try to raise their own websites' search engine rankings by
submitting linked blog comments like "Visit my discount
pharmaceuticals site." This is called comment spam, we don't like it
either, and we've been testing a new tag that blocks it. From now on,
when Google sees the attribute (rel="nofollow") on hyperlinks, those
links won't get any credit when we rank websites in our search
results. 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.
http://www.google.com/googleblog/2005/01/preventing-comment-spam.html
-Kevin
