Social media optimization is very important technique for white hat seo. Social media optimization back link means you will fill up your profile to every social media and you will place your website with specific category based and unique keyword based criteria. In this way your website will get huge traffic. Now a days there have minimum 100 popular social media available. Like facebook, twitter, instagram, Google plus, ask.fm, youtube, stumbleupon ,vk, vine, viewen, my space, pinterest and many others. Perfect social media optimization backlink will increase your website rank on search engines and will increase the page rank of your website also.