Absolutely, there is no denying that social media marketing has become a very vital component added to SEO strategies being designed today. Social media marketing can help you in the following ways:
a) Generate quality and targeted traffic towards your website
b) Help you build personalized relationships with potential and existing customers
c) It allows you to connect with your genuine fans directly thus increasing trustworthiness of your brand and products
d) and of course promotes and develops a good branding

I am only known that facebook is good for marketing.