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If you are blogger and has been on blogging for a while,you know there are two kind of hyperlink we can use in our blog..Dofollow and nofollow links.
When you link out to a site,you give a vote to the linked URL. a relevant quality dofollow link that pointed to your site act like a strong vote which will increase a rank weight for your target keywords.
Google created the"no-follow"tag for a reason. The purpose is to help webmaster define or to prevent un-trustworthy sites from ranking.It also tell the search engine search engines "Don't follow links on this page" or "Don't follow this specific link." .
Below quote from GOOGLE:
"Google does not transfer PageRank or anchor text across these links. Essentially, using nofollow causes us to drop the target links from our overall graph of the web."
"However, the target pages may still appear in our index if other sites link to them without using nofollow, or if the URLs are submitted to Google in a Sitemap. Also, it's important to note that other search engines may handle nofollow in slightly different ways"
So,spam comment on vast amount of nofollow blog is no good.
But if you think commenting on dofollow blog are safe and good in terms of SEO.Then may be you should rethink..Previously I was spending a lot of time doing this task. Most of the times I thought I found a dofollow blog, after spending time to go through the content and comment on it, the link I posted was actually nofollow.Not do mentioned those spam filter which i will talk about later on this post.
Can live without "nofollow"
Just imagine if sites like Facebook and Twitter were do-follow. It would be a horrible place to be.Shameless spam wont miss any change even a nofollow links(ok, just imagine the spam you see on those sites now but 100 times worse).
SEO gurus would recommend you to commenting on a dofollow blog.You most probably ended with spaming upside down getting some easy backlinks to your site.Yeah you hate to do that but you have to.
These are some popular spam comments that often been used.(even myself)Check out Spam comments SEO Link Building
