NYPD officials have been taking courses at “Twitter school”

Police departments around North America have gradually, if warily, come to embrace social media as a way of communicating with their communities. But things can quickly go awry on Facebook and Twitter, a lesson the New York Police Department learned in April when a photo contest designed to showcase friendly photos of citizens with police officers was taken over by images of police aggressively subduing people. A month after the #myNYPD fiasco, top NYPD officials have been taking courses in using Twitter effectively, the Wall Street Journal reports.