If you have read any of my ebooks, particularly my small business search engine domination ebook you will know I am a big advocate of social media for SEO benefits.
The main reason is simple. The Google algorithm is based to a large extent on sites linking to other sites. But other than SEO companies who really links to other sites anymore? Most people will use social media to ‘share’ as opposed to actively linking to another site from their highly authoritative homepage.
The hard data on how social media impacts on SEO is pretty limited. However it’s my belief that in the future things like social media authority and authorship (how important Google thinks you are as an author) will have a huge influence on your position in Google. At the end of the day Google wants to deliver the best content and the best content is written by people with authority and is shared a lot.