I agree with most of the reactions to your post.
Social media is extremely important. I found this article and I try to make good use of it. Unfortunately I am unable to insert the link. Look for 'SEO ranking factors'.


It shows how important Facebook and Google are.

google cares to all social networks

Fine question, Learn that social media will not a link building resources for your website, most of the Social media will provide only no follow links but some of may help you by do follow.
Most sites will only caches you link to google search.