Google adjust the nofollow attribute effect

 Because he can guarantee the correct identification of the reptiles and the prevention of the generation of a large number of spam, and restrictions on the export link, but the recent SMX Conference above mattcutts said nofollow effect has been reduced.

Has been doing search engine optimization students nofollow considered as a reliable factor.
Reduce the effect, there may be too many SEO a lot of abuse nofollow, resulting in a lot of effective pages are not indexed, another important point, Google believes that due to the large number of nofollow, PageRank is not effective delivery. Of course, there are more rumors: such as Google to depth crawl certain pages and content, strong push Canonical property.

In fact, it is difficult to imagine the consequences of the Google reduce nofollow role, probably Analysis:

1, paid links and spam may Nofollow other sites from the page PageRank value is not, strictly speaking, is not to be counted after the opening, although only Nofollow, but because of Pagerank effective transfer of decay, but from the number of levels or from a quality level, or will be delivered. This will result in more paid links and more of spam. For example, the bolg reviews so much, is not artificially increase the difficulty of the webmaster? Is not the noise of the Google algorithm has increased? These are the core of the problem is possible.  

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2, JavaScript before is not crawling, Google can crawl, but Nofollow in time, it will not cause some duplicate content. If I let go, then there is not duplicate content exists? Course, will come from the data model, if a website usability or an internal structure made sufficient OK, can distinguish such content.

Although Google adjustment is not clear, the effect is exactly what the situation, but at least can know the after-effects of the release. If so, it is possible to reduce the operating range of the page, the page code requirements will be higher in the SEO. And more use of the robots.txt file and Canonical properties.

All this is possible. But still return to Google often say the phrase: do a good website, there is nothing to worry about.