Blogspot is No-Follow Blog, Why Commenting on It?
Did you know that blogspot.com blog is not a "do follow" blog (in the comment)?
Theoretically, it doesn't add more backlink to your site, thus not increasing the search engine ranking for your site.
Is it useful commenting on a "nofollow" blogs?
The answer is (in my opinion): It's still useful. It's right that Search Engine doesn't follow the link to your site but it increase your site visibility in term of organic user/visitor.
So, don't hesitate to use your site URL as an ID when commenting on blogs, regardless it's do-follow or not.
Most common mistake when using URL as an ID on comment. Many commenter don't provide ' http://' prefix before their site. It's bad because Blogger will automatically change link without ' http://' prefix with relative-path link from the blog address.
For example, if you only put www.you.com without ' http://' as the URL on your comment ID in this blog, blogger will change it into http://rubencook.blogspot.com / www.you.com .
So, don't forget to add the ' http://' prefix on your URL.
Just my thought!