Forget friending. A new Facebook app allows users of the social network to identify and share people, places and things as “enemies” for all to see. The app, called EnemyGraph, lets you list anything with a Facebook presence — ranging from “friends,” to foods, to products, movies or books — as an enemy. Since the app launched March 15, it’s seemed to appeal especially to users with a liberal bent. Some of its most-selected nemeses so far include Rick Santorum, Westboro Baptist Church and Fox News. The app was developed by a professor and two students at the University of Texas at Dallas. Dean Terry, who directs the school’s emerging media program, helped conceptualize the project, while graduate student Bradley Griffith and undergraduate Harrison Massey built the app. Griffith said...