Blog commenting is one of the easiest ways to get backlinks to a new or old website. In fact, an effective blog commenting strategy will make sure your backlink graph remains constant or go up with time.
Bloggers who wants to do for Seo perspective, do it to create backlinks, some for increasing Alexa rank and some for spreading knowledge. Blog commenting plays an important role to attract traffic i.e. to get visitors on to the blog or website and create a relationship with the users or readers. Here is some Blog commenting sites