To make sure the message conveys the intended tone
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if you say something face-to-face, the other person can see your face and hear the tone of your voice. The flat words that you say can be misinterpreted, but your tone and expression can provide clarity. If I say, "Yes, I totally believe that.", with a smirk on my face and in an exaggerated tone, you can understand that I'm being sarcastic, and that the actual meaning is the OPPOSITE of what I say.
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It depends on what you compare it with: Sending by post: -you have to wait a while -maybe someone else read it -it may not reach the person (change address, etc.) Personally delivering letter: -unless you're very close, it still takes time -you can't do anything else while delivering -you might make a mistake and send it to wrong place Sending email: -maybe someone else read it -it may not reach the person (change address, spam filter, etc.) -the person might not read it, if it looks like spam -it might be considered too informal
There are many situations where hearing the whole message might make a big difference in your response. One situation might be someone calling to let you know they will be late and you are upset. Your response may be anger until you hear the reason they are going to be late if it is an accident or emergency.
One might convey a new born baby to friends by sending friends letters, instant messages on social networking sites, or by simply talking to the friends.
a disavantage is that sometime someone will not understand the message so when you get feedback that answer might show they have misunderstood therefor the cycle is in one way not completly effective.
When they are in distress.