Many blog about websites offering do follow and no follow back links, but in many cases the dofollow link might have been changed to nofollow one as time passed. So how can we find that if the links in comments section is dofollow or not? You may also like : How To Quickly Submit Sitemap
Before proceeding let me explain to you what is meta tag? and what difference exactly the meta tag can bring? What are meta tags? In simple words Meta tags are actually the words which provides search engine the info about your site or the web page,search engines use this information when building their indices.