Do-follow blog commenting currently represents one of the most effective off-page optimization methods. It will boost SERP positioning over a short timeframe. It is one of the only link building methods that provides both high PR as well as relevant anchor text in the links created for your site. What is Do-Follow Blog Commenting Exactly? Many blogs allow for interaction with their readers via user generated content (UGC) also known as “commenting”. The main purpose of our service is to find high PR pages on the various blogs that allow this and comment on those pages, including your link and anchor-text. If your comment is approved then it provides your site with a strong backlink which Google will interpret as a sort of virtual “Thumbs Up” for your website.
As of late, using blog commenting as a backlink source has become much more difficult than in the past. As webmasters are becoming more educated on the ways of the web, many look to protect their pagerank from leaking out of their site via spam. By placing “rel=nofollow” on all of the outbound links generated by users they can tell the search engines not to pass the PageRank, authority or anchor-text relevance to the site being linked. The overwhelming adoption of this no-follow method has made tracking down authority blogs that are “do-follow” much more difficult.
According to Ryan Deiss, the above chart will show you how many links from PR X website will push your website PR.

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