What does social media provide in terms of SEO?

At MWI we hear many of these inquiries from current and prospective clients. Although social media has been an increasingly popular channel for marketing in recent times, many companies haven't yet begun to take advantage of the potential of it.

What exactly does social media have to in relation to SEO?
At MWI we hear many of these inquiries from potential and current clients. While social media has become a growing channel for marketing in recent years, most companies haven't yet begun to take advantage of it.