Hi Gracie915!
I'm applying to a media studies program myself and feel your pain. My interests are pretty diverse too and I'm having a difficult time articulating them into a few sentences.
I feel talking about The Social Network- the movie is a great way to start your essay, but you need to cut your statement short so that it reflects and eventually leads to what your particular academic interests are.
I am personally interested in the changing nature of media and how old forms of media are accommodating new ones and in turn how we the consumer/audience are affected by these changes.
If I were to use the movie as an example, I'd talk about how an older form of media (movies) is representing a new and popular form of media (social networking) and what its success means.
If your focus in on human-media relationships (which is what I gather from your introductions), you could probably focus on Facebook and its overwhelming popularity which led to an eventual on screen portrayal of its creation that people were willing to pay to watch.
I hope this helps. I also feel the posts above are extremely helpful. After reading one of them I've decided to drop my anecdotal hook for good. Lets hope it works out!
Good luck with your application!