Thanks for the reply, What if all the backlinks come from no-follow referrals.It's a good way to create backlinks, yes. But, I think you want to know if it will give a good benefit to the websites. It depends on the websites you comment on mostly. If you are posting on a high traffic page with manually approved comments, you could see a big benefit from traffic and increased page authority. If it's a spammed blog page, you will probably not see much benefit in boosting your website up anywhere, but it can help index your website, so people mostly use it on their Web 2.0 sites to make sure Google indexes them and they have some authority.