Blog, DoFollow Vs No Follow

Hallo the virtual Information buddy! how are you today? This afternoon I will write an article tips to increase Google Page Rank of the two, emang there first? There donk please see here. This time I will discuss a blogging tips that backlinks from dofollow blogs, what is the purpose of dofollow blogs? dofollow blog is a blog that has facilities backlinks automatically when the visitor to the blog provides comment and put them in the post comment link article dofollow blog owner. Confused? a simple as this:
One day I was reading an article in one of dofollow blogs. because I want to get free backlinks from blog owner

source : http://asksalman19.blogspot.com

nofollow is a value that can be assigned to the rel attribute of an HTML a element to instruct some search engines that a hyperlink should not influence the link target's ranking in the search engine's index. It is intended to reduce the effectiveness of certain types of search engine spam, thereby improving the quality of search engine results and preventing spamdexing from occurring.

sample :

<a href="http://www.example.com/" rel="nofollow">discount drugs</a>

see more : http://en.wikipedia.org/wiki/Nofollow