Social media will always have an impact on SEO factors and it helps in improving site ranking. Social sharing will be a new way to build backlink and it is main part of SEO efforts. This is the main reason now Google is starting taking social share in to their account and looking at the page backlink as their strong factor.
#1 Google uses twitter for information sharing
#2 Social shares are becoming the new link building
#3 social media influence boost the authority
#4 Google plus is a good ranking factor