This is why text messages are 160 characters in length
by karlcow
And why 160 characters? Again, when Hillebrand discovered during his research that the average post card usually contained around 150 characters; people were already used to communicating using so few characters. (Telex messages were usually around this length, too, meaning that business users could easily adapt to text messages.) You’ll also find that your average e-mail today isn’t much longer than a text message.
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