Twitter is abuzz with a new topic: “If I had a gun.” The responses make one glad there’s a First Amendment—in a wistful sort of way. On one hand it’s kinda sick that we live in a society where teens are happy to Tweet that they’d kill Justin Beiber fans, or haters or, perhaps, the Beib himself (there are thousands of Tweets). On the other hand, as they say in the UK, better out than in. If Mr. Dupuis’ family is smart enough to subscribe to his Twitter feed, they’ll get a heads-up on Zach’s suicidal fantasies. If Hazza’s “friends” see this message, they’ll know whether to take it seriously or not (I’m thinking yes) and intervene if necessary. In the Internet age, it’s not just who you know, it’s knowing what they’re thinking. For good and ill.