By Nick Bilton October 14, 2012 12:00 pm October 14, 2012 12:00 pm A pulled pork taco hovered about four inches from my mouth when my phone impolitely interrupted me. “Hey, I see you’re having people over. O.K. if I stop by?” read a text message from someone whom I had not invited to my dinner party. How did the person know I was even having a party? I needed only to glance at my guests, who were
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