Can any one tell me how to do blog commenting and how to search blog sites for comments. What all the steps we have to follow in blog commenting.
Why don't you Google about blog commenting , you would know. BTW, I have an article hope it helps http://bit.ly/ayctpD
blog commenting is easy, just read and share your thoughts. You can start a thread to ask for bloggers with dofollow blogs, and check out their blogs. You can also check out Hubpages, and leave comments on related articles.
Search in Google with these term site:.edu or site:.org " your niche" + comments then you will find millions of sites that are waiting for you.
Use the google dofollow blog search and search the blog in your niche by entering the keyword / keyword phrase. Then, make commenting on it
There are people advertising their services on DP that can help you do that, as well as there are certain tools like SB, that can do that automatically. Of course, you can always do the slow, manual way. The only thing that you have to do is to install Firefox nofollow checker and do searches in Google like ones guys suggested above.