By default all blogger blogs are having 'nofollow' attribute to prevent comment spams. How to make Blogger comments DoFollow 1. Log into your Dashboard. 2. Go to Layout and click on edit html 3. Check on Expand widget content 4. Now search for following code in your template. (Note: The code may be different from the bellow code. Understand the logic ) <dl id=’comments-block’> <b:loop values=’dataost.comments’var=’comment‘> <dt class=’comment-author’expr:id=’â€comment-†+ data:comment.id’> <a expr:name=’â€comment-†+data:comment.id’/> <b:if cond=’data:comment.authorUrl’> <a expr:href=’data:comment.authorUrl’ rel=’nofollow’><data:comment.author/></a> <b:else/> <data:comment.author/> </b:if> <data:commentPostedByMsg/> </dt> 5. Now just remove the code in RED that is rel='nofollow' . This code adds the NoFollow attribute to your Blog. You can also change it to rel='follow' making links in comments indexed by search engines. 6. Save your template.
basically - do follow means a search engine follows the links from one site outbound to another site hence possibly increasing your page rank try reading:- http://lmgtfy.com/?q=what+is+dofollow and http://en.wikipedia.org/wiki/Nofollow
It is very hard to manage the comments for a do follow blog owners. Because there is a big number of comments on a page and it is hard to telly evryone. So the trick of moderation is best i think.