The bandwidth-sync correlation that's worth thinking about

Check this out. Every once in a while a cool graph pops into my head.

Here are a dozen or so forms of communication, arranged on two axes.

On the horizontal, they rank from asynchronous (meaning the creator and the responder are separated in time--like a letter) and synchronous (meaning the creator and the responder are in real time proximity to each other--like a phone call).

Up and down, I've charted the quality of the medium. Quality in terms of density of information exchanged. The 140 charac