I prefer to keep the back side blank (and non-glossy) so when I am out, and I make an appointment with someone, I can give them my business card, and write the time and date of the appointment on the back as a reminder.
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I like to think of a business card as a mini billboard. To much writing, and nobody will read it. a little writing, to answer the simple quick questions is just enough. "Who are you?" "how do I contact you?" "What do you sell?"
Name
Contact info
occupation (and/or the main product you sell)
