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Both techniques plays an important role in seo off-page. But Article Submission is better then Blog posting you see better results through article submission make sure that your article is unique and meaning full with proper keywords, don't used more then 3 or 4 keywords in one article it creates a bad effect to your site as well as your article.
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article can not be separated with the name of the blog, so kalu want his best selling should reproduce the article to make people more interested to visit
