Do not confuse Social Media for SEO with Social media for conversions. They can overlap, yes, but often they don’t.
You want to identify and foster an audience that will follow, like, share, retweet, etc.
If the people who make buying decisions do not congregate together online, you need to find an audience that does, one you can engage. This is often the case in B2B.
If your social media program does not create search engine ranking authority, you need a separate social media for SEO campaign.
Read More Here: http://searchengineland.com/2013-seo-playbook-143224