A social media marketing agency focuses on helping clients grow their social media presence. This can include managing their accounts, creating new social media content, increasing engagement, and more. The goal is to bring in more traffic, leads, and sales through social media rather than focusing exclusively on other forms of marketing. There are several advantages to hiring a social media agency. First, they can often create content faster than you can on your own. It can take time to come up with the right strategies and to actually create the content.