As online marketers, the Nofollow Tag is probably one of the most important features we should be aware of. It was originally created for the meta portion of websites to communicate to search engine bots not to follow links on a certain page. It now appears as part of individual link code giving webmasters more control over which links are and are not followable.

Ex.

<a href="http://www.mmriley.ws" rel="me nofollow">My website</a>

This was intended to prevent spamming on blogs. If the links aren't followable, then the link will provide no value to the linked website's page rank and will not improve the page's search engine optimization.

If you are commenting and posting your website's link to blogs in order to create inbound links that raise your SEO, then you may be wasting a whole lot of time. Blog owners who host their own Wordpress blogs have the option to change their links to allow following, but blogs at Wordpress.com, Blogger, and other privately owned companies automatically set all links to "nofollow" and bloggers cannot change it.

If you are a blog owner, you should know if your blog is a Nofollow blog. This too can affect your own links.

You can read here how Google handles the Nofollow Tag.