Police Focus on Social Media After NYPD Killings

Police departments have little legal recourse against people who threaten violence against their officers, but they are aggressively monitoring social media in hopes of identifying dangers and thwarting violence. A warning from Baltimore County Police officials, who learned about an Instagram post that suggested Ismaaiyl Brinsley planned to kill police officers as revenge for the deaths of Michael Brown and Eric Garner, came too late to stop the fatal shooting of two New York Police Department officers.