Actually i do not know anything about
SEO or do follows but thanks to satyakam due to this educative post i got an opportunity to learn
i found that dofollow is the latest and rapidly increasing way to spread links through blog/site's regular visitors or even say readers and which really helps to distinguish from spam posts to informative posts,but how far this can be effective is still to be seen
The first blog service to introduce the dofollow and nofollow distinguishing links to the individual blog owners is wordpress.com