目前有一些人认为nofollow会浪费权重和PR值，根据的都是Matt Cutts的一篇文章：PageRank sculpting，里边最核心的是下边的这句话：
“So what happens when you have a page with "ten PageRank points” and ten outgoing links,and five of those links are nofollowed? Let’s leave aside the decay factor to focus on the core part of the question.Originally, the five links without nofollow would have flowed two points of PageRank each (in essence, the nofollowed links didn’t count toward the denominator when dividing PageRank by the outdegree of the page).More than a year ago, Google changed how the PageRank flows so that the five links without nofollow would flow one point of PageRank each.”
原文翻译：
如果你有一个页面PR值有10点，这个页面中有10个链接，有5个是导出链接，那么会发生什么呢?让我们撇开衰减因子(见备注)，把重点放在问题的核心部分。以前，没有nofollow的5个链接每个会得到2点PR值，nofollow之前每个链接分到1点的PR值(其实，在分配链出页PR值的时候nofollow的链接数没有计入分母)。一年多以前，谷歌改变了PR的流动方式，没有nofollow的5个链接每个只得到1点。
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