Also in 2005, nofollow tags were created as a means to combat
spam.
SEO pros began using this tag as a way of PageRank sculpting.
Google also unleashed a couple of noteworthy updates:Jagger, which helped to diminish the level of unsolicited
link exchanges that were flying around, as well as
heralding the decline in the importance of anchor text as
a factor due to its corruptibility.Big Daddy (coined by Jeff Manson of RealGeeks), which
improved the architecture of Google to allow for improved
understanding of the worth and relationship of links
between sites.20 YEARS OF SEO: A BRIEF HISTORY OF SEARCH ENGINE OPTIMIZATION