Vocal-and-nonverbal-communication

When you picture people you talk to on the telephone, through e-mail or in newsgroups (such as in your Kaplan class) before meeting them face to face, does your expectation of how they will look usually turn out to be accurate?
What vocal and nonverbal cues did they use that led to your picture of how they would look?
How are nonverbal cues displayed in computer mediated communication (e-mails and newsgroups)?
What do nonverbal cues such as typos, slang, spelling errors, incomplete sentences, and poor sentence structure communicate to the receiver about the sender?