Social Media is the place where people connecting with each other. So, there are many peoples with different countries, different languages, attitudes, taste and mindset etc. If our website, pages designed according to their user's taste & expectations, then definitely we can attract more number of visitors to our website and sell our products to them. So, Google thinks it's a natural process and give importance to Social Media Websites. If we do promote our website through Social Media in right way, then we will definitely achieve better rankings in SERP..!
All we need to do this to create fresh and unique content, attractive images, special offers in our social media websites and share it to our targeted visitors..!