Facebook, YouTube and Twitter increasingly provide the way rival gang members threaten each other, reports NPR. The practice is called “cyber banging,” and it’s often led to fights and even death. There still is rancor in some Chicago neighborhoods over a long-running feud on Twitter between Chicago rappers Chief Keef and Lil JoJo, both associated with rival gangs. Three years ago, shortly after Lil JoJo issued a taunt along with his location, he was killed. This year, police say cyber banging fueled the death of another Chicago rapper.