Who is your intended audience? From your use of terminology (e.g., content-cnetric context," "multi-sensory context") it appears that you are aiming for a fairly sophisticated audience already familiar with online communiciation issues.

If this is so, I wonder if the advice that follows is helpful. Could experienced online communicators be expected to already know these things? Conversely, if your intended audience is the inexperienced online communicator, then I think your introductory paragraphs should be more simple and explanatory.