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Social bookmark is the important part of SEO. Basically, it is used to increase the search engine ranking. Suppose you are taking backlinks from high-quality sites then obviously you are collecting quality backlinks for your website and you do also get a better response from the search engine. As a proverb, we can say, as we go high we do feel so cool, likewise, if you are getting quality backlinks there will be the better chance on the search engine and your blog or website also rank high on SE