Search engine optimization has not been dependent on a minimal number of factors for a long time now, such as number of times a keyword appeared on a page, and it continues to become a more complex web of on and off-page factors every month. One of the more recent factors that has had an impact on search ranking is social media.
This infographic breaks down ways that social media influences the visibility of your website in search results, including:
Social media can help search engines find and index your content faster Likes, shares, retweets, etc. indicates to search engine that content is new and interesting, often leading to a temporary increase in rankingsYour content will increase in search results for people connected to youIncreases domain authority and the number of inbound links to your website
SEO and Social Media why it works and how it helps your ranking. Excellent infograpic.