Social media are most widely useful for promotion of any content. In another mean if we say no content can be viral without social media. SEO is the basic need to get rank any content or video in search engine first page but social media like facebook , twitter, Instagram give a special attention to bots that this content or video is valuable to users on the internet. So now google and all the other search engines give the priority to social media backlinks and signals. More signals means more users talking about the content or video. This way google and other search engines rank the content well in SERP.
You can find social sharing links or buttons below the video and you may just click and share it to your particular acocunts in social media websites. This is something like one click and blast to all of your community either in google plus, facebook , stumble, dig or any of your favoirite community. While your friends love your content there give you comments and share your content further google search engines give extra credit to the content as most sharing means most valuable content. There are so many methods you can prmote your content in these community or you may hire some expert for the job you can get our service ate owedia.com/seo