There is no point on commenting on NoFollow blogs as it will be useless for the spiders and your link will not count.
To learn more about Search Engines, make sure to read “The Anatomy of a Large-Scale Hypertextual Web Search Engine“,
The best place to start is to do research on Dofollow blogs in your niche. Start in google. For a great list visit, the Young Pre Pro post “List of 51 DoFollow blogs to Comment on” – This is a good list to start.
Get the best out of your blog and make the spiders work for you.
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