nofollow is an attribute of the HTML tag value. It provides a way for webmasters to tell the search engine " do not follow the links on this page " or " don’t keep track of the specific link. This tag is to tell the meaning of the search engine of the link is not edited after the author’s own, so this link is not a vote of confidence.
so, in this case, nofollow is the major search engine providers (for example, Yahoo, Shanghai, noble baby love etc.) in order to deal with spam links (Spam) introduced a property.
Nofollow attribute is introduced: usually, the reverse link is will transfer the weight, so do some of the Shanghai dragon in order to add links in the forum and blog content released a large number of irrelevant links with. The existence of these spam links caused a certain degree of trouble to the search engine to evaluate the quality of web page.
before the first to talk about Sina, NetEase two portal blog to prevent malicious spam blog chain using the nofollow tag syntax, Sina blog nofollow existed in the past, but now I see not in the blog with nofollow tags, but now is really NetEase blog with rel=" nofollow" nofollow tags you will not need to send the NetEase blog. Following a comprehensive analysis from five aspects under the nofollow label.
first, what is the meaning of nofollow?
from the five knowledge points in comprehensive analysis of nofollow how to use nofollow tags and tag writing: first, what is the meaning of nofollow. Second, the nofollow attribute of the tag. Third, the correct format rel nofollow. Fourth, the application of nofollow. Fifth: what is nofollow and noindex.
In the analysis of
blog and website system with nofollow attribute. That is to say, leave the link on other people’s blogs to get the PR value of the practice is usually futile, especially the celebrity blog, basically use the nofollow tag.
At present, most of the
second, use the nofollow attribute of the tag
but it is worth to point out that the website to add the nofollow attribute of the tag does not represent the search engine included not only the link is not included in calculation of the reverse link. In fact, it is to attract spiders crawl your website, but the website does not give you what weight transfer. If you’re worried about the website link spam harassment, the nofollow property is a very good "link spam firewall".