What do you mean, rel=nofollow?

What do you mean, nofollow?

Nofollow is a property value of the HTML tag, Google recommends using Nofollow, tells the machine (crawler) do not have to track the target page, is to prohibit spiders crawling and transfer weights, but if you are directly through the Sitemap to submit the page, the crawler will still crawl, The nofollow here is just an attitude to the target page of the current page and does not represent the attitude of the other pages to the target page. Usage: rel= "nofollow", originally to reduce the impact of spam links on the search engine, because in the comment message page left the link, the webmaster is not sure where the link points, do not know is not spam links, so the general use of rel= "nofollow" to stop spiders crawling.

Use of nofollow

There are two ways to use nofollow:
1. For meta META Tags:

1	<meta name="robots"content="nofollow"/>

Tell the crawler that all links on this page are not tracked.
2. For a label:

1	<ahref="login.aspx"rel="nofollow">登录</a>

Tell the crawler that the page does not need to be traced.

The role of nofollow

Nofollow has three main functions:
1. To prevent untrusted content, the most common is the blog spam and comments in order to get the chain of spam links, in order to prevent the page point to some pull rubbish pages and sites.
2. Paid links: Google recommends using the Nofollow property to prevent paid links from affecting Google's search results rankings.
3. The crawler crawls the effective page: avoids the crawler to crawl some meaningless page, affects the crawler to crawl the efficiency.

PR Trim (Pagerank sculpting)

nofollow abuse, some SEO in order to achieve the maximum search engine optimization, through the nofollow to control the flow of PR, can be very good to optimize some specific pages. Of course, this optimization is more suitable for some have accumulated a considerable amount of PR of the old site. In order to prevent PR pruning and nofollow abuse, Google has weakened the role of nofollow, the previous nofollow not only will not cause PR flow, and will not cause PR loss, now the nofollow rules, although will not cause PR flow to the target page, However, the original target page will be lost. For example, the current page PR is 1, and there are 10 links on the page, one of which is nofollow link, according to the previous nofollow, each non-nofollow link to the target page will get 1/9 PR, links with Nofollow can not get PR, And according to Google's new rules for nofollow, non-nofollow links to the target page can only get 1/10,nofollow link also cannot get PR, that is, the loss of 1/10 Pr.

What is the difference between a nofollow tag and a meta robots tag?

Nofollow tag is forbidden spider Crawl tracking this link, while meta robots tag is forbidden spider crawl Tracking or index entire page link, limit the range of different, can choose to use according to need.

SEO Suggestions

Nofollow in Google's role has been very weak, so SEO to control the site's PR flow, to avoid links to spam pages, only rely on the method of manual audit.

What do you mean, rel=nofollow?