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Direct from the Source:Danny Sullivan: If an article is retweeted or referenced much inTwitter, do you count that as a signal outside of finding any non-nofollowed links that may naturally result from it?Google: Yes, we do use it as a signal. It is used as a signal in ourorganic and news rankings. We also use it to enhance our newsuniversal by marking how many people shared an article searchengineland.com/what-social-signals-do-google-bing-really-count-55389
What Might Be in a Tweet Algo?• Number of Unique Tweeting Sources (Diversity)• “Author Authority” of the Tweeting Sources• Time of Tweet (QDF)• Connection Between Tweeter and Source Domain• Quantity + Quality of Retweets• Quantity of Clicks www.seomoz.org/blog/google-bing-confirm-twitter-facebook-influence-seo
#2: Data Suggests Some Other Influences on Rankings, Too