PageRank Sculpting 是一種對(duì)內(nèi)頁(yè) Link Juice 操控的SEO技巧，通過對(duì)Page Rank流向的操控，來得到最大的優(yōu)化效果。該技術(shù)一直是專家級(jí)別的SEOer所采用的站內(nèi)優(yōu)化手法。但是，Matt Cutt 在SMX會(huì)議上說了這么一段話

So today at SMX Advanced, sculpting was being discussed, and then Matt Cutts dropped a bomb shell that it no longer works to help flow more PageRank to the unblocked pages. Again — and being really simplistic here — if you have $10 in authority to spend on those ten links, and you block 5 of them, the other 5 aren’t going to get $2 each. They’re still getting $1. It’s just that the other $5 you thought you were saving is now going to waste.

用大白話講，

調(diào)整前
如果把一個(gè)頁(yè)面可以流出的 PageRank 比喻成一桶水，把導(dǎo)出鏈接比喻成水管。
如果有5根水管往外輸水，你將其中的1根水管用 nofollow 扎起來，那么每個(gè)水管輸出的水 (link juice) 就是總量的 1/4

調(diào)整后
仍然把一個(gè)頁(yè)面可以流出的 PageRank 比喻成一桶水，把流出的水分別倒進(jìn)5個(gè)杯子（剛好能裝下）
其中1個(gè)杯子用nofollow蓋上了杯子蓋。那本來該流進(jìn)這個(gè)杯子中的水，就白白浪費(fèi)掉了，另外4個(gè)杯子得到的水 (link juice) 還是總量的1/5