Social media itself is a catch-all term for sites that may provide radically different social actions. For instance, Twitter is a social site designed to let people share short messages or “updates” with others. Facebook, in contrast is a full-blown social networking site that allows for sharing updates, photos, joining events and a variety of other activities.
Why would a search marketer — or a site about search engines — care about social media? The two are very closely related.
Social media often feeds into the discovery of new content such as news stories, and “discovery” is a search activity. Social media helps to form links that in turn support SEO efforts. Individuals also search social media sites to find social media content.