Several case studies looked at how social signals influence search engine rankings and which have the highest impact. Likes and shares on Facebook, retweets on Twitter and +1s on Google+ influence SEO rankings for low-competition keywords, even for pages with duplicate content. Tweets from power users may impact short-term keyword rankings. If you want to increase your rankings, but you don’t have time to leverage all of the social sites, spend your time on Google+.
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