How to prevent Google from following a link
So you have certain links on your website that you don’t want Google to follow. What is there to do? Simply set the “rel” attribute of the hyperlink tag to “nofollow”:
<a href=”http://www.geekpedia.com” rel=”nofollow”>Geekpedia</a>
This will prevent search engines from following the link to http://www.geekpedia.com from your page. The browsers will treat it just like any other link, however. This also means that PageRank (in Google’s case) will not be shared with the linked page.
This tag validates against XHTML 2.0.