Communication has changed drastically over the past 100 years; and yet our methods of adapting communications to new technology has been grossly lacking. I think there's merit in exploring alternative means to replacing conversational cues with marked up tags when written out in electronic format.

This can also minimize misunderstandings.

Just as we use <strong> to show importance and <em> to show emphasis, we can go further for adding additional context cues to text. Suggested tags include:

<sarcasm>  (text slanted left?)
<confusion>  (aLtErNaTiNg CaPs?)