A pulled pork taco hovered about four inches from my mouth when my phone impolitely interrupted me, the New York Times reports. “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 sharing messages and photos of the dinner to their online social networks…