When someone leave a comment,your site is linked automatically into his website or profile url.If you don't like this you can stop it doing this very simple trick.Simply follow the steps below to do it:
1.Login to your blogger dashboard--> layout- -> Edit HTML
2.Click on "Expand Widget Templates".
3.Scroll down to where you see below code:
<b:if cond='data:comment.authorUrl'> <a expr:href='data:comment.authorUrl' rel='nofollow'><data:comment.author/></a> <b:else/> <data:comment.author/> </b:if>
4.Now replace above code with below code:
5.Save your template and you are done.
Now your site will not linked to commentators sites/profiles.