PageRank sculpting VS Nofollow Tag

Use rel:dofollow for your internal linking Google has cofirmed that external linking of any kind bleeds PR from the page. Following or nofollowing .

It been over a year Google use it to ranking system. Why tell us now?

Quate
A: For a couple reasons. At first, we figured that site owners or people running tests would notice, but they didn’t. In retrospect, we’ve changed other, larger aspects of how we look at links and people didn’t notice that either, so perhaps that shouldn’t have been such a surprise. So we started to provide other guidance that PageRank sculpting isn’t the best use of time. When we added a help page to our documentation about nofollow, we said “a solid information architecture — intuitive navigation, user- and search-engine-friendly URLs, and so on — is likely to be a far more productive use of resources than focusing on crawl prioritization via nofollowed links.” In a recent webmaster video, I said “a better, more effective form of PageRank sculpting is choosing (for example) which things to link to from your home page.” At Google I/O, during a site review session I said it even more explicitly: “My short answer is no. In general, whenever you’re linking around within your site: don’t use nofollow. Just go ahead and link to whatever stuff.” But at SMX Advanced 2009, someone asked the question directly and it seemed like a good opportunity to clarify this point. Again, it’s not something that most site owners need to know or worry about, but I wanted to let the power-SEOs know.

Quote:matt cutts

“Google itself solely decides how much PageRank will flow to each and every link on a particular page. In general, the more links on a page, the less PageRank each link gets. Google might decide some links don’t deserve credit and give them no PageRank. The use of nofollow doesn’t ‘conserve’ PageRank for other links; it simply prevents those links from getting any PageRank that Google otherwise might have given them.”

If a link on your website is internal (that is, it points back to your website), let it flow PageRank--no need to use nofollow. If a link on your website points to a different website, much of the time it still makes sense for that link to flow PageRank.

The time when I would use nofollow are when you can’t or don’t wxnt to vouch for a site, e.g. if a link is added by an outside user that you don’t particularly trust. For example, if an unknown user leaves a link on your guestbook page, that would be a great time to use the nofollow attribute on that link.

Quote:Danny Sullivan's
http://www.mattcutts.com/blog/pagerank-sculpting/#comment-347553

With this change, I can still get the $4 if I simply don’t allow comments. Or I show comments, but I use an iframe, so that the comment actually reside on a different page. In either case, I’m encouraged to reduce the number of links rather than let them be on the page period, nofollow regardless. If I’m worried my page won’t seem “natural” enough to Google without them, maybe I allow 5 comments through and lock them down after that.

Rather than clarify things, I feel like this is what your post is going to do -- cause people to consciously reduce the number of links they allow on their pages. We’re going to see an increase in iframe usage or other techniques to reduce links and flow more PageRank to the remaining links, for those who really worry/believe in such things.



The above question still not directly answerd.