Does Mass Communication mean only Journalism? Isn't there other aspects to the course?

NO. Mass Communication also means Broadcasting. Mass communication relay information through mass media to large segments of the population at the same time. Whatever means you will use as long as you're communicating and giving valuable information, that is Mass Communication. Once you finish Mass Communication, there are lots of opportunities when it comes to work. 

Many other media channels, digital/cyber/social media are of great exposure impact as well.