What is Media Literacy

What is media literacy and what kind of questions can I ask to better understand it? The definition of media literacy to my understanding is the ability to interpret and use the media in a unique way to deliver a message or express oneself. I feel like this definition can be interpreted more ways than one depending on the person and how they choose to communicate, however, I believe that because it is vague, there are more options one can do to use media as a form of communication. Examples of media literacy include but are not limited to youtube, facebook, twitter, blogging cites, and match.com; in all of these, you make an account with a picture, a small paragraph about yourself, optional details like age, birthday, etc., and you can upload videos or posts about what you like, think, or feel. I have provided a link so that you can see an example of media literacy. This is a facebook profile.