Before choosing a nofollow or dofollow for a blog, we should first understand what the purpose of the blog nofollow and dofollow blogs. Based on what I know as follows.
Understanding Nofollow
Nofollow is an HTML attribute value used to instruct some search engines that a hyperlink should not influence the ranking of the target link in the search engine's index. This is intended to reduce the effectiveness of several types of search engine spam, thereby increasing the quality of search engine results and preventing spamdexing from happening. function for attribute values are not intended to impede access to content, or to prevent the content to be indexed by search engines. Nofollow is a term in your blog / website that if we give comments on the blog the link when commenting that our input was not considered a backlink by search engines like google, but still others can be visited through the links that we put in comments. Initially, each gives a chance nofollow blog, meant to reduce spam but can be converted into dofollow.
Understanding Dofollow
Dofollow is the opposite of nofollow, dofollow tag does not really exist, because the only term to distinguish with nofollow links. When you leave your link dofollow, so when search engines read your page and find the link, he will further explore these links so that search engines produce a report, in this case relates to the number of backlinks, or DoFollow is a term in your blog / website if us to comment on the blog so that our input link when commenting it would be considered as a backlink by search engines such as Google. DoFollow Blogs are usually much sought after by poachers pagerank backlinks to increase their blog.
The description above is a glimpse of understanding about the nofollow and dofollow blogs as I know, hopefully can give you some idea.
