Digital marketing isn't just social media, and social media isn't all there is to digital marketing. There's a big picture to understand before jumping in, and it shows how social media and the other pieces of digital marketing work together.
The biggest difference between service based companies and ecommerce companies is this: digital marketing is lead generation for both. Ecommerce companies take it one step further and turn leads into customers in the same digital realm, whereas service based companies make their sale after services are scheduled and performed.
In the diagram below, you'll see how digital marketing gives you lead generation in a service based company.