Yik Yak

Police: Mount Sinai High School Student Arrested For Threatening To Blow Up SchoolPolice said the ninth grader used a social media app called Yik Yak to make the threats.
School Officials Crack Down On Yik Yak Messaging App After Threat In New JerseySeveral school administrators in the Tri-State Area have decided to ban the popular app Yik Yak, after it led to threats of violence at a New Jersey high school.
Seen At 11: Yik Yak, Anonymous Texting App, Stirs Up ControversyWith the help of the app Yik Yak, nameless users across the country are making shooting and bomb threats, causing school lockdowns and even evacuations.