If you find one, let me know.
More seriously though, it might be a good idea to just let the people wander to your comic.
ie. Post some nice drawing, and they will go to your site to see if you have more.
And they can't blame you they clicked the link...
I also noticed that if you mention something about your comic people are likely to check it out, just to know what you're talking about.
ie. someone posts a nice drawing you can say "I wish I could draw that good", and people will check if you are just beeing humble.
Also there is that thing called "webcomic above thread", where we give reviews to each other. And other ways, like "random plugging thread" that happens every once in a while.
Generally, just be cool, post funny/wise stuff, don't annoy people, and everybody will like you, and they will visit your comic if you mention it.