Speaking of silent reading, it turns out it is not so silent:
http://www.jneurosci.org/content/32/49/17554.full
We differ as to how different decoding speech is from decoding text, or Braille. They engage different senses for intake, but the ensuing brain activity engage more or less the same brain activity (visual/motor/auditory). It is a virtual reality summoned by means of language.
I can imagine some future technology which directly stimulates language centers, bypassing senses altogether. That would be reading, as well.
Practically speaking, there are of course differences in how one engages with the media.