I hear the number 80% more often from psychology graduates, concerning how much of language is body, but I don't know where that number comes from either (except that my teacher says it). It's why I really didn't want to use the stat, because I knew it would sound like it was coming out of my ***. But yeah, it's a widly agreed you don't use more than 20% to communicate in writing over the internet. Even less if you're bad at setting a tone for your writing, or you don't have enough time.
For example, your post's tone could have been read as: irritated and skeptical or sad and relective. I took it as irritated and skeptical, but it's really a coin flip deciding if you are.
QUOTE(Lea Winterman @ 2006)
In a study in the December Journal of Personality and Social Psychology (Vol. 89, No. 5, pages 925–936), they find that people overestimate both their ability to convey their intended tone–be it sarcastic, serious or funny–when they send an e-mail, as well as their ability to correctly interpret the tone of messages others send to them.
http://www.apa.org/monitor/feb06/egos.htmlDetailing an experiment of interest, which tests how people think they can convey a message correctly, or read a message correctly, and how often they are actually successful. It turns out to be not much better than 50%. I hear my teacher reference this experiment a lot, so I'm pretty sure it's not fabricated. But who knows, maybe he's using the same source as me.
I probably do it a lot, maybe even in this post too, but it's really baffelling how we always think our tone is obvious, and will sometimes even leave out more solid, factual statements, because of this. One reason Serious Discussion is a joke, anyway.