Well duh, usually I end up having written something that I didn't set out to write in the first place. What I merely tried to say was exactly what it said: I put words in the order I want someone to read it. My homemade reality reaches the reader the way I want it to reach him or her. What (s)he does with it after is something different entirely.

In the direct sense you describe we can never be watched on the internet. Not even while chatting, because there we have a timelapse as well.
But doesn't RL do the same thing, albeit faster even? There is a timelapse in between popping the question, thinking about it and providing the answer. You can watch the person think, but you cannot reach into his or her brain. It isn't an illusion like a canvas or a text is, but it's still not direct communication and we still don't know if we're truly watched or listened to. We only get the feedback a little quicker. ;-)

Every comment will become a new canvas (for the writer doesn't know if it will be read/watched), but it has solved the first uncertainty. Every comment creates new uncertainty, but solves the previous one.

Is writing genuine letters also speaking with ghosts? Think about the time lapse with those!