Hey guys, sorry for the late reply.
The "promote" class in question was not created by me, so its from either the starkers theme or in the default wordpress somewhere. And I have checked in the comments.php and its not there. I used the process of elimination to find out that its (for some strange reason) located somewhere in the <?php the_content ?> in the single.php file.
Like I said before, I’m running the site on my localhost at the moment for testing, so it’s not possible for you to view it. I’ve saved some screenshots in my dropbox to show you guys though.
What the user sees: http://dl.getdropbox.com/u/841020/promote-class.png
The HTML: http://dl.getdropbox.com/u/841020/promote-html.png