Case study: Nofollow tags for search engine's powerful sniper

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Hello everyone, I am the autumn rain. For the nofollow label I have a special feeling, the front I gave you an analysis of nofollow tags in large-scale industry network use and nofollow label use How to grasp a "degree" two case analysis. Today, I passed the two-day experiment for you to analyze the nofollow tags on search engine index and indexed sniper effect. NOFOLLOWR Most use is Google's search engine, and then Baidu also formally declared support nofollow tag. The main use of the nofollow tag is to tell the search engine not to track all links with this label, do not give the chain to index and included, in order to prevent irrelevant link weight loss purposes. The most commonly used for nofollow tags is the user registration, shopping cart, novice help, contact us, company introduction, about us, site statistics, site Map, privacy protection and so on with the theme of the chain and outside the chain. But the role of the nofollow tag is more in the index of the invalid URL and included, the following on the search engine for NOFFOW tags indexed and included to prevent tracking:

1, from the above data and included in the page can be seen, because the product properties of the link to filter by a large number of similar content, for the existence of a large number of the same content of the invalid URL address, will be greatly dispersed site weight, a large number of waste of spider crawling time. So blocking search engines for similar pages of the collection and indexing has become an important issue. As a result, I used nofollow tags for links to these product property pages.

2, the use of nofollow tags in the next day after the data collected results:

Using nofollow tags the next day spider crawling page situation:

From the similar physiognomy page link using nofollow after the next day of the collection analysis and spider crawling look, Baidu included from more than 5,000 down to more than 800, Google also from more than 40,000 down to more than 2000, and spiders with nofollow tag pages do not crawl, Visible nofollow tags for the search engine index and the inclusion of the sniper is very to the force.

The above data analysis by: Swiss watch www.gudoi.com watch brand Network collation published, reproduced please keep the link, thank you.