Backlinks is the important part of SEO beside on your content, building backlinks is must to do when you want to increase your rank and pr, but you must do this correctly and do not use a spammy technique, simple use a natural backlinks as you can.
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Social networking sites are good for attract traffic, as backlink concern its must be noted that links are dofollow or nofollow. Such links are mostly nofollow are not counted as backlinks. It is better to comments on dfollow blogs.