The “No Follow” tag (rel=”nofollow”) was created by Google to fight Spam in blog comments in 2005. There have been confusion among webmasters and bloggers whether the tag should be used or not. One thing is sure, it did not stop spammers who found other ways to abuse the system and post their links anyway. Basically, a “No Follow” tag tells Google not to count the link in their calculation of Page Rank for the linked site. Paid links and affiliate links should have the tag.
A site that “Do Follow” with lots of external links will have difficulty to increase its PR as the juice flow is transferred to the sites linked. Consequently, more back links that also “Do Follow” are needed. It is then important not to go from one extreme to another and balance the site with “No Follow” and “Do Follow” links. “Do Follow” blog comments may ensure participation from visitors in writing content, but all comments have to be reviewed manually to delete Spam comments.
For this blog, I will “No Follow” some links I have in my posts but will “Do Follow” comment posts. I have installed the “NoFollow Free” plugin and hope that this will encourage comments. I will publish comments that add something interesting to the blog and delete the others.
My 2 favorite links on the subject: