I observed the top 10 from google, i found a lot of comments in these site backlink. comments is spam, unrelated, why it can bring ranking
aixia300, Thanks for asking this question!
It really got me search for what the most up to date thinking on blog comments were and well, most of the well known thought leaders in seo seem to just pass over the idea that blog comments have any value. I did stumble upon a good article about blog commenting from
Mike Collins at SEO Site Checkup.
In
this article and
others, he talks quite a bit about blog comments, whether they have value, if they have link value, and what is their real value today.
I think what he and others are saying are valid, blog comments have some, not much SEO value, but they have networking and audience value.
What I am not saying is that follow links don't count, they do and will always. Google, if not already, may devalue links they know come from blog comment sites, ie site that allow any links to come out from it and so using that as a strategy, mass commenting may not have lasting value.
If you can tap into either the links or audience, you will move ahead your site and brand.
Hope this helps!
Shawn