\nThis is just a new building block that lets software makers have better<\/p>\n
granularity–at a link level instead of a page level. And they can declare<\/p>\n
things about the authorship of a link that they couldn’t before. Lots of people<\/p>\n
are using it to do smart things; for example, LiveJournal can recognize<\/p>\n
authenticated users and they won’t get the nofollow tag. So it’s not the case<\/p>\n
that every comment or trackback will be reduced in value. Last week, a software<\/p>\n
maker didn’t have that ability, but now they do.<\/p>\n
In other words, if you trust<\/p>\n
a user or like their comment, it won’t be hard for them to get search juice from<\/p>\n
commenting on your posts. I believe that adding this flexibility for software<\/p>\n
makers will be a very helpful thing in the long term.<\/p>\n
google guy has commented in battle media blog here, battellemedia.com\/archives\/001197.php#9161 about the new nofollow attribute which will be added soon to comment spam to prevent comment spamming,<\/p>\n
Read more on google’s effort to combat comment spam here,<\/p>\n