For a beginner, these terms really get pretty confusing. Dofollow and nofollow. What these things really are and what do they have to do with you and your blog comments?
First of all, let’s be quite technical about these two things. Basically, dofollow is the default setup of links and comments. It means that when you comment onto a certain post in a particular blog, you benefit both each other with your page ranks. If you’re running a PR5 blog and is commenting on a PR2 blog, chances are that person might get higher ranking because of your juice.
In a nofollow link or comment, on the other hand, just by adding rel=nofollow to the embed HTML code, you tell Google spiders not to share any juice with other sites or not to follow the link within the comment.
Given this description, you might say it’s better to fix your blog in a dofollow way, so that when people put up a comment, it will benefit you. You can increase your page rank as well as you can land on the first few pages of the search engine results. Though there is a slight chance of a problem, that if too much harmful sites pass through your website and is linked too, it can affect you in the long run.
So that’s why nofollow blogs are not necessarily bad. The last time I checked, both of these tags bring human traffic to your website, even if the nofollow one. That being said, we land on the two types of traffic, the human traffic and the SEO traffic, human traffic is still way better than just the latter, as human traffic can effectively be converted to sales after the visitors see your product. You don’t necessarily fail just because you use a nofollow markup. You might not have the highest page rank because you told the spiders not to share juice to other links and vice-versa, but if you gain traffic, there’s no problem at all. The people won’t even know that you’re using a nofollow blog. Why? Because they won’t bother reading the HTML markups.
Still unclear? Let’s put it this way. Even after visiting a nofollow blog and adding useful comments, Google or search engines most likely will not share that site’s juice with you. But if other visitors found your post useful or they loved what you can offer, they will more likely visit your site to know who you are. How would they know it’s you? Just put your link in the link field you fill up before commenting.
Another downside of dofollow blogs and comments is that since people who are desperate with SEO will use your site to gain juice. So they will send spam comments to you, which in turn would be out of hand in the near future. So if you want less hassle, it would be better to use a nofollow blog.
This thing is totally up to your preference. In my case, if you’re a newbie blogger, you can use dofollow tags, but if you’re already having high traffic, spare yourself of too much spam, use nofollow tags.