If you're posting a comment on a related website or blog in your own niche, I know that you get a back link if you leave your own website's address in the comment area and the administrator of that website doesn't remove it, but is that the only way to get a back link? For example, when you are leaving a comment, most comment forms ask for your website address. This is usually requested in a special area on the comment form. If you leave the address to your website in this special area and you don't leave it in the actual comment itself, will this leave a back link to your site? The reason I'm asking this question is that I now have a site that is getting 20+ comments per day, but very few of them are leaving any type of web address in the comment itself. Are these comments that visitors just want to leave, or are they getting back links because most of them do leave their URL address in the special area that requests their address? One last question - Most blog comments are "nofollow" - why is that? If you do have a blog, are you better off to have your comments assigned a "dofollow" or "nofollow" tag? I would think you would be better off to have them assigned a "dofollow" tag so that more people would leave comments. Just curious.