How can Social Media be used for SEO?

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The popularity of social networking sites on the Internet offers not only opportunities for friends to meet again online, or get in touch with your old classmates and office mates, but a new opportunity in the field of search engine optimization strategy. This article illustrates several ways an SEO practitioner can use social networking to increase rankings, build trust and authority within a selected niche.
Because there might be thousands of social networking sites on the Internet, this article primarily focuses on the top four most popular social networking sites. They are Facebook, MySpace, Twitter and Linkedin.