Social Media Marketing is interesting for several reasons. The first reason is that it is relatively new. Since it is a newer concept, it is more interesting to learn about. Not only that, but it also means more potential for job opportunities in the future.
The second reason social media marketing is interesting is because it reaches a very wide variety of audiences. Since social media is everywhere now, the marketing for it is too. This means wider reach, a more diverse audience, and more specified marketing.
One more reason why social media marketing is interesting is because there are so many platforms and channels for marketing. There are so many social media sites that are huge right now creating a lot of opportunity to market. Between Facebook, Twitter, LinkedIn, and countless others you are practically guaranteed to reach your intended audience.