nofollow 150
[ 25 ]August 29, 2007 Seomoz.org (http:/ / http://www. seomoz. org/ blog/ questions-answers-with-googles-spam-guru#jtc33536), SEOmoz comment by
Matt Cutts.
[ 26 ]February 20, 2008 Interview with Adam Lasnik of Google (http:/ / http://www. toprankblog. com/ 2008/ 02/ adam-lasnik-video/ )
[ 27 ]"Nofollow Reciprocity" (http:/ / http://www. inverudio. com/ programs/ WordPressBlog/ NofollowReciprocity. php). Inverudio.com. 2010-01-28.. Retrieved 2012-01-09.
[ 28 ]"''nofollow'' criticism at" (http:/ / blogoscoped. com/ archive/ 2007-01-22-n21. html). Blogoscoped.com. 2007-01-25.. Retrieved
2012-01-09.
[ 29 ]"''nofollow'' criticism at http://www.marketingpilgrim.com" (http:/ / http://www. marketingpilgrim. com/ 2007/ 01/
campaign-to-reduce-wikipedias-pagerank-to-zero. html). Marketingpilgrim.com. 2007-01-23.. Retrieved 2012-01-09.
[ 30 ]Official Google Blog: Preventing comment spam http:/ / googleblog. blogspot. com/ 2005/ 01/ preventing-comment-spam. html