In an article by Danny Sullivan with Search Engine Land, Google and Bing were questioned on how social media influences organic search. The results show that there is indeed weight placed upon links shared through Facebook and Twitter.
This again stresses the importance of professionally maintaining Facebook and Twitter campaigns. The more information (from credible sources), the better. Not only is this information indexed by search engines, it provides high quality backlinks to your website. There is also a higher level of customer interaction on most of these platforms (Facebook, YouTube, Twitter, etc.)….