Using canonical tags and nofollow webmasters - Profit Hunter

The Linkscape index has been updated. There is fresh data for the last 30 days (we take into consideration in this article). What do the data give us? This update gives us the opportunity to see many interesting points about using a web search for tags and directives. Understand what's what.

Growing popularity of canonical tags

For those who do not yet know what cononic tags are, a little help:

The canonical tag ( meta tag) was announced by Google on February 12, 2009. The purpose of this innovation is to spoil the duplicate content, indicating the preferred version of the URL address for the page. Yahoo and Microsoft have also reported on the introduction of this tag.

How does it look in practice? If your website or blog has different URLs for the same content, then the canonical tag will tell search engines the URL that should appear in the search. In this case, all characteristics, such as reference weight, etc., will be transferred to the correct version of the address.

A canonical tag is added inside the tag. HEAD. ... / HEAD. on pages with duplicate content (example):

. link rel = "canonical" href = "http: // www. site. ru / seo / stranitca. html ”/.

P. S. This is the basics for a reminder. Look for more on the Internet. I give a tip: you can look at Devaki.

Back to the topic. As shown by statistics from the data obtained, this tag is becoming increasingly popular with webmasters:

Using canonical tags and nofollow webmasters - Profit Hunter

As you can see, the total number of using canonical links is small and takes less than 1% of all pages (just think). This means that repetitive content is still very common and takes a large share. So check your content.

The nofollow attribute becomes less popular

While the canonical tag is gaining its practical popularity, it is also impossible to say about the nofollow attribute, as can be seen from the following graph:

Using canonical tags and nofollow webmasters - Profit Hunter

The percentage of use of nofollow goes down, both on external and on internal links. Although a greater blow falls on the internal. Most likely - this is due to the Google update on accounting links with nofollow. I will publish this topic in the next post. For now I’ve provided a link to the original article.

Linkscape Index Statistics for May 2010

In the month of May, the Linkscape Index has the largest number of unique root domains ever indexed:

  • Pages: 41 202,970,156 (41 billion)
  • Subdomains: 289,291,281 (289 million)
  • Root Domains: 85,725,739 (85 million)
  • Links: 424,255,504,138 (424 billion)

You can observe the graph of growth in the number of root domains below:

Using canonical tags and nofollow webmasters - Profit Hunter

This graph indicates a large increase in the emergence of new domains in the network. Now let's look at the growth of the index:

Using canonical tags and nofollow webmasters - Profit Hunter

Peak growth in early 2009 is associated with an increase in the size of the index at the request of users. The disadvantage of this increase is that it correlates poorly with quality. Therefore, the index itself requires improvements to account for large data and for a longer period. Index growth is planned to increase. The main task is the value of the link and page. If you do not take into account the surge in the index chart and compare it with the chart for the root domains, we see that the Linkscape index is almost the same size (an average of 44 million pages) and is undergoing slight changes. Why then on such a growth of domains, the index is not so big? The size ? quality.

P. S. Accept this schedule as unfinished. The guys will update the algorithms and everything will look more interesting.

How SEO and Linkscape define links “followed” against “nofollowed”


  • 301 redirect
  • normal HTML links
  • refresh tags in meta (Google treats it with the path 301), like. META HTTP-EQUIV = ”Refresh” Content = ”3; URL = https: // profithunter. ru ”. . In the text, this means to go to the profithunter site in 3 seconds. ru. Can be used to refresh the page at regular intervals. This topic is more suitable for chats, to update the data.
  • pages with rel = "canonical" directive to another URL


  • links with the rel attribute = ”nofollow”
  • links on pages with meta robots = ”nofollow” directive
  • automatic detection of links to blog / RSS feeds (we are sure that Google ignores such links)
  • 302 redirect

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