Whether you hate or love social media, you've no choice but to leverage it. Why? Because search engines use signals from GooglePlus, Twitter and other social networks* to determine how high a website will rank in search results.
To elaborate this in detail Indian-SEO-Company created an infographic that shows what is social signal and how it can influence SEO?
And perhaps more important the visual explains some innovative ways to boost your site's social signals. Take a look at few of them.