Most blogs come with 'nofollow' tags built into the comment area. This was originally supposed to be a way to deter spammers because their links wouldn’t be indexed by the search engines.
So, if a search engine (like Google or Yahoo) sees a rel="nofollow" tag on a link, they will ignore it. They don't follow the link, and they don't count the link in the site's rank (the site of the person who posted a comment).
Some bloggers got together and created the "I Follow" movement and it's built up a lot of momentum. Blogs today have the ability to control the comments on their blogs (either through various plug-ins or moderation) so the 'nofollow' tag is not really needed anymore.
I removed my nofollow tags from this blog because I want to allow anyone who leaves a comment, a real link in return. In other words, by removing the 'nofollow' tag, a search engines will be able to find the link that you leave in a comment or when you link to any of the posts here at An Unschooling Life, or my adoption blog and you'll gain a backlink on the the search engines as a result.
What about you?
Are you going to share the love (the link love that is) and join the "You Comment, I Follow" movement? Check the bottom for a loooong list of other Do Follow bloggers. :-)