First of all let me give you a short explaination what a “nofollow” and a “dofollow” link are and where the different!
Links with nofollow tag are not followed by the search engine spiders, this means you will get no better rankings for these links, you still could get some traffic but your search position will be unaffected.
A dofollow link is indexed by SE bot´s/spiders, the bot will follow the link to your site, will count the links to you and will scan your site (This is a very complex process and many other factors will interfer with it)! This is what you want to better your search engine rankings!
Why use dofollow links on your blog? Here are only some of the main reasons:
It will attract more visitors, people will come to you to comment on your posts and to get backlinks to their site. Many of them will return and, if you puplish good content, become active members in your blogging community.
Your blog will become a more valuable resource for your niche from all the content and resources releated to your niche (from the comments), with good content, other blog´s and sites will start to link to you as avaluable resource of backlinks and information. Think about the lists in forums, e-books or other blogs, showing you some dofollow blogs, why not be on these lists too?
Now after I made clear why to use dofollow links, here are the links to 2 do-follow-WP-plugins (free), I added a akismet link to, this plug-in filters spam out of your comments!
You get free content from your visitors, this is a nice bonus for the search engines!
dofollow links WP: This plug-in simply removes the nofollowtag, so all links on your blog become dofollow!
CommentLuv: This WP plugin searches for the last post made by someone commenting on your blog, and shows a link to this post in his comment, this is a very nice feature and will attract some more visitors to your blog!
I love links: This plugin sets all links from one blog-visitor to DoFollow, after he made a certain number of comments on your blog! This is another nice way to prevent spam on your blog!
Akismet: This plug-in filters spam out of your blog comments, this will save you a lot of time!