Dofollow vs. Nofollow
The majority of blogs implore the nofollow tag in their comments. That means that when you specify your website URL when leaving a comment, the link created does not help to elevate your website’s status in the algorithms search engines use. Although not really an “official” term, people often use dofollow to describe blogs that do not use the nofollow tag. In other words, comments left on these blogs do help to elevate your website’s status in search engines.