Social media marketing refers to the process of gaining traffic through social media sites. 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. FB is our choice as well as most of my clients.
The results and analytics from their Insights Reports can be very impressive as long at your page is maintained properly
How Are Search & Social Media Marketing Related?
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 can also help build links that in turn support into SEO efforts. Many people also perform searches at social media sites to find social media content. Social connections may also impact the relevancy of some search results, either within a social media network or at a ‘mainstream’ search engine.
(some information from: https://searchengineland.com)