Many major search engines and blog software vendors came together to make a link “nofollow” attribute. The “nofollow” tag allows people to leave static links in the comments of blogs that search engines may not count for relevancy.
Essentially, the tag is designed to be used when allowing others to post unverified links into your site. It is a way of saying, “I did not provide an editorial vote for the other page.”
You also can use it if you are linking out to shady stuff, but do not want to parse any link credit to the destination URL.
Many webmasters are likely to be a bit sneaky and create fake blogs and then spam their own blog with links off to high-margin website affiliate programs.
The “nofollow” feature looks as follows:
The rel=”nofollow” tag may also make it easier for many webmasters to cheat out reciprocal link partners. However, I am a big believer in karma, and doing things like that will likely come back to hurt you.
Also think of the “nofollow” tag as if you were a search engineer. If a site was full of nothing but unverified links, would you trust that site as much as a site that had some trusted editorial links to other sites? I wouldn’t.
Search engineers, such as Google’s Matt Cutts, are trying to push webmasters to use “nofollow” on ads sold on their sites. Unless the use of “nofollow” is built into your content management system, I would not recommend using “nofollow.”
Using it is a way to define your site as an SEO site that may be trying to manipulate Google’s index.
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