These are few advantages, we can get from social media -
Traffic, Website’s visibility, Communication channel, Unpaid advertisement, Ease of the target, Sharing quick updates, Close relationship with customers, Quick Popularity.
Social media is the biggest platform to promote and make people aware of your products and websites. So posting on various social media sites will increase the number of visitors to your website.
Social media optimization is all about exposing your website on social media channels like Facebook twitter, google plus, linkedin, stumbleupon; it helps you in building good social media reputation with more traffic, which is considered by Google while ranking your website in search results.
With the help of being active on social media channels, you will be able to receive a lot of traffic to your website and it will increase the visibility of your brand which is important for SEO of your website.