Media neutrality is best explained as text that is not influenced by the medium in which it is placed.
I believe that media can be both. If you are on Facebook, the message that is put out to the public is not 100% what you want to say. Many times, you post what is appropriate because you have family members or coworkers that view your page.
Media neutrality is a good thing. It helps the author categorize where the content should be published.