Categories Articles A 13-year-old girl was arrested over an Instagram post threatening copycat killings after the Florida school shooting Post author By crystalg Post date February 21, 2018 Business Insider Feedburner Tags 'Copycat', 13YearOld, After, arrested, Florida, girl, Instagram, Killings, Over, post, School, Shooting, Threatening ← Are You on the Right Track? Test, Test and Test Some More. → Billy Graham Dead at 99