“nofollow” tag is a way for webmasters to tell search engines dont follow links on this page.In default option wordpress automatically adding nofollow tags for user generated content such as comments and trackbacks.
In general,Google dont follow this links.that means Google does not transfer PageRank or anchor text across these links.So this is a great way to increase your page rank.Most of the big sites use (rel=”nofollow”) tag to get higher page rank on search engines.So if you decide to use tag nofollow in your wordpress blog here is the,
list of best nofollow plugins for wordpres
WP No External Links : Mask all external links to internal! In your own posts, comments pages, authors page… It does not change anything or write to base – just processes output.
Now you don’t need to worry about your page rank or index, dropping because of spam bots. You write any kind of http link – and it becomes internal or hidden! You can configure plugin to work with your own posts, pages comments and authors’s profiles. you can also disable link rewriting, and use “rel=nofollow” and <noindex> tag instead of it.
Ultimate Noindex Nofollow Tool : Improves your blog’s search engine optimization by “noindexing” pages you choose.
Add the noindex robots meta tag to archives, categories, search pages, tags, author pages, login, admin pages or any other page you choose.
Add the rel=”nofollow” attribute to individual pages listed by the wp_list_pages function or the Pages widget. Also, add the rel=”nofollow” attribute to archive links, category links, registration and login links
Nofollow Reciprocity : Most big sites by default use ‘nofollow’ tags therefore not trusting external links nor users that post those links there. This means that they don’t give any credit (in the form of PageRank) to those links and are essentially considering them spam.
This plugin detects links to above mentioned sites, and puts ‘nofollow’ tags on them.
Nofollow Case by Case : Simply add /dontfollow to any comment link you do not like and it will automatically become a nofollow link. That`s it!
JR_NoFollow : This plugin allows you to enable/disable the nofollow tag on your comments.
You have the option to disable nofollow on the website url field links, as well as disabling it for links in the comment body field.
This will allow you to reward your users for commenting on your blog by providing them with a DoFollow link, so it should help you to gain more comments.