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Google invented “nofollow” to help webmasters and site owners counteract spam. All this was started in 2005. With blogs such as wordpress by default comments are nofollow, but you can set this to dofollow if you want which is an incentive for users who are familiar with this to comment in your site.

When doing SEO or even Viral Marketing, Blog Commenting if done in moderation can help search engine rankings. By commenting you can gain more backlinks, but there are a few things to consider – whether the link you have gained from commenting is a dofollow link this link will carry more weight then a nofollow atleast to googles algorithm.
Here I have put together a little secret for when commenting and looking out to comment on Blogs which have dofollow. You can copy and past this text into google search box and replace “keyword” with the keyword that relates to the niche you are in and then the results will give you dofollow blogs to comment on: – keyword “Remember my personal information” “Notify me of follow-up comments”
Although dofollow is more useful on an SEO perspective, I personally recommend to comment on both dofollow and nofollow as this will make the links you are gaining to your site look more natural particularly in Google’s eyes. I also find when commenting on nofollow blogs I tend to get more click-through’s because generally the site is less spammy when getting a nofollow link so the visitors are more genuine.
Now when you are commenting you want to be sure that the blog post you are commenting on is relevant to the link you are submitting. Secondly better you keep your name as your real name and your blog url, I do not recommend using any other keywords other then your real name where it asks this because Google is kind of smart enough to pick up if you are trying to cheat the system. Just be careful.
If you are kind of new to the whole nofollow and dofollow game and don’t know how to find which are dofollow and nofollow links, I recommend you install a firefox plugin
Download and install Zachary Fox’s NoDoFollow, a useful Firefox extension that highlights the links on any side and color code them according to DoFollow or NoFollow status with either pink for NoFollow or light blue for DoFollow. With this simple plugin, you can easily differentiate which links are DoFollow and which are not, all with just a right click!

























Do follow OK
No follow OK
Combination of do follow + no follow is better for natural growing backlink in search engine eyes. Remember, google new algorithm code name "Panda" is very smart to eliminating the page which only collecting do follow link.
i think do-follow links are important for creating backlinks, otherwise its useless for an SEO to comments on no-follow blogs.