An anonymous reader writes "The University of Pittsburgh has been plagued with 78 bomb threats (and counting) since February 14. It started low-tech, with handwritten notes, but has progressed to anonymous emails. Nearly every campus building has been a target. The program suspected is anonymous mailer Mixmaster. The university has been evacuating each building when threats come in (day or night), and police departments from around Allegheny County have offered assistance with clearing each building floor by floor with bomb sniffing dogs. There is a popular tracking blog set up by a student as well as a growing Reddit community. Is there any foreseeable defense (forensic or socially engineered) to a situation like this?"