Social media marketing is the use of social media platforms to connect with your audience to build your brand, increase sales, and drive website traffic.
Social media itself is a catch-all term for apps and sites that may provide radically different social actions. For instance, Twitter is a social site designed to let people share short messages and media links with others.
Facebook, meanwhile, is a full-blown social networking site that allows for sharing updates, photos, joining events, groups and a variety of other activities.
Social media often feeds into the discovery of new content such as news stories, and “discovery” is a search activity. Social media can also help build links that in turn support SEO effort. Many people also perform searches on social media sites to find people and content.