It's all about me: Why e-mails are so easily misunderstood / The Christian Science Monitor - CSMonitor.com
Also, in another source
(I culled these links from "Cracked," BION): "One study at UCLA indicated that up to 93 percent of communication effectiveness is determined by nonverbal cues. Another study indicated that the impact of a performance was determined 7 percent by the words used, 38 percent by voice quality, and 55 percent by the nonverbal communication."
I think I'm going to stop reading and responding to comments, because they're even more "immediate" and misunderstood than email.