Matt Cutts: Facebook, Twitter Social Signals Not Part of Google Search Ranking Algorithms | Search Engine Watch
https://searchenginewatch.com/sew/news/2325343/matt-cutts-facebook-twitter-social-signals-not-part-of-google-search-ranking-algorithms
https://searchenginewatch.com/sew/news/2325343/matt-cutts-facebook-twitter-social-signals-not-part-of-google-search-ranking-algorithms
https://searchenginewatch.com/sew/study/2319951/facebook-likes-shares-dont-impact-google-search-rankings-study