this is about how to dofollow comment on your wordpress blog without plugin, as manually you can dofollow your comment by editing the comment template (comments.php)
fint the script
comment_author_link();
this will display the complete link in your single page/post like
<a id="commentauthor-2306" href="http://antiteori.com" rel="external nofollow">d_anank</a>
now change that script to:
recaptcha are the anti spam method using captcha. may captcha just using leter and or number but recaptcha using 2 word in different image with AES (Advance Encryption System) on sending the code.
this is available in wordpress plugin called WP-reCAPTCHA
If I Exploration “Wordpress” finally I can also create a widget.
I have successfully made the plugin / widget for wordpress.
I gave the name “user-login-widget.”
with this widget you can easy login from front/home page of your website without goto the login page 
Here I want to share with you
