A massive emphasis is put on blog commenting in SEO but I just don't understand why... If one wishes to improve the ranking of a site organically and is doing so by commenting on blogs with their URL, I just don't see how this is organic or natural! I mean, think about how many sites you have found useful... how many of them have you then gone and linked to in a blog comment? I appreciate that link diversity is important but I just wonder if there are many people who have had successful SEO campaigns but not bothered with the blog commenting, because everywhere I look that is what people are talking about here, and there are so many tools released in order to improve it! I'm new to SEO so I don't have any experience to back this up but I just don't see how it looks natural and would appreciate other peoples thoughts on this too!