Advantage of voice posts - tone & inflection. It allows you to make points that you can't in writing (people can get a better sense of whether you mean it or not). Knowing which words are the most important to you can matter a whole lot!
That is true. I remember reading once about some guy who got so p%$&ed off that he didn't talk to his friend for six months because of lack of inflection (http://www.pointlesswasteoftime.com/misery.html).
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