you can get back links by commenting a blog, but if you comment a blog just make sure that it is full of sense and interesting. smart comment will make you and your site popular. more popular you are a better and more backlinks you'll gonna have.
Blog commenting is useful to create a good quality of backlink. These backlink increases the website visitor. If you do your blog commenting into referral or niches website then you could get more benefit on getting a lead to your business. It play important role in increasing the page rank of the website.
If your comment is useful and relevant to the topic then it is possibility for approval and if it is dofollow surely helpful to increase pr of your website
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