SEO FAQ - Search Engine optimization

Nofollow is a co-ordinated efforts from Google, yahoo , MSN to stop crawling links that are considered not trustworthy or spammy. Today many blogs, message boards, forums, news sites use nofollow tag to prevent spam in their comments or other areas of the blogs or forums. Now there is a new tag that is similiar to rel=nofollow that is rel=external nofollow, external nofollow works the same as nofollow tag but this tag opens links in a new window instead of the same window. If you want to try just add rel="external" it will open the link in a new window. it sort of works like target=_blank. Target blank opens all hypertext links in the new window and rel=external nofollow, blocks all link juice and opens the link in a new window.

So if you find a blog that uses this dont get too excited, links from these blogs dont count. Move on and better luck next time.