What is No follow.
From Wikipedia the definition is
“nofollow is an HTML attribute value used 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.”

This means that with a nofollow put into the link Google will not follow or count the link against the person who owns the website but also will not count the link as a plus to the writer of the comment.

Most blogs now automatically include nofollow in the comments.

I disagree with Nofollow
Why I totally disagree with nofollow. I moderate all comments. My thank you for an actual comment it the active link. If I get even a whiff of you not reading the article and leaving a comment you are toast.

Why should the content you are putting on my website not benefit you as well as me?

I love comments.. State your thoughts on this one.

I Give you Link love
Any comment I approve from this blog will not have the nofollow attribute activated.  It is very easy getting link love from me.

This is a Dofollow Blog.  We love comments.