One way that is often do by the webmaster to improve the ranking of a blog or website is to increase the number of backlinks to their blogs. To increase the number of backlinks, the one alternative that is often done is to find a blog or website that use Dofollow system. But not all Dofollow system has an advantage, so you also need to know some of the disadvantages Dofollow that may arise from Dofollow backlinks. To avoid the negative impact of the Dofollow blog, then we have to combine with Nofollow blogs.