A 15-year-old girl strolls through London's Berkeley Square. Suddenly she hears a beep from her cell phone and looks at the screen. A message sponsored by Starbucks informs her that two friends from her "buddy list" are walking nearby. Would she like to send them an instant message to meet for coffee at the nearest Starbucks around the corner? She merely has to click "yes" on her smart phone to send the message. And she gets an electronic coupon worth $1 off a Frappuccino.
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