Some would say that a social media manager is just someone who uses Facebook all day. That is not the case. A social media manager at a full-service digital marketing agency will also act as your branding manager. The focus is interacting with your customers, both new and existing ones.
A digital marketing agency will act on your behalf, transparently and effectively so that your social brands are representative of your brand image. This way you could focus on your business, not just the tedious social media interactions that could suck up a lot of your time.