Hello DF: Most blogs are not allowed leave a comment with a website URL. so How can I leave a comment with a website URL?
Most of the time the email field works as url field, but in many cases the only way is to post it on the comment and that would be spam. this link should help your increase you page rank as it seems that's why you need to post your link on comments: http://www.wissamidrissi.com/2008/07/list-of-doffolow-links.html I wrote this back in 2008 so sorry if you find broken links.