Most blogs use NOFOLLOW in the commentary, but I see that Google displays the comments in my search results page!
What sense NOFOLLOW?
I know that he, when Google indexes your blog URL, as well as from the comments. But I get confused about the meaning of NOFOLLOW now.
You are confusing "NOINDEX" to "NOFOLLOW". To ensure that your comments do not appear on Google search results, the owner of the blog will use the robots meta tag with "NOINDEX" attribute, which reads as follows:
This meta-tag that search engines do not index the site, and therefore not included in the search.
Most blogs use a comment link on the other hand, is "NOFOLLOW" attribute. Contact with "NOFOLLOW", including condoms link will look like this:
link text
If the robot is searching for that link, which is not to crawl a site on the other end (at least not here). In addition, the link is not PageRank of your site, which has received. This is what makes Google, when it comes to using NOFOLLOW links:
We adhere to them. This means that Google does not pass PageRank or anchor text for these links. Essentially NOFOLLOW us the main goal of our image links on the website. Nevertheless, the purpose of the pages can still be in our index if other sites that link to them without NOFOLLOW, or if the URL sent to Google on the Web site. It is also important to note that other search engines can NOFOLLOW in slightly modified form.
When should I use "NOFOLLOW" attribute to work with Google's policies? In three cases:
1. If you are unsure about the quality of the content on the site you're linking to
2. If someone has a link (for example, the company buys ads on your blog)
3. If a page at the end of any traces of compounds (for example, a link that to access a password-protected page)
So, why the owner of the blog "NOFOLLOW" attribute in the comments section of my links? Since they could not verify the quality of web sites around the world, based on the comments. To avoid spammers or bad neighbors, only NOFOLLOW links.
Pay attention to the fact that there are two ways to obtain "NOFOLLOW" attribute this to a friend. You can do this on a global scale, based on the meta-tag and NOFOLLOW all links in this page, or you can use it on the spot, and add "NOFOLLOW" attribute only certain links.
The first requires the following code in the head section of the site:
Secondly, the same as the previous example.