With the Society for Terrorism Research (STR) 8th Annual International Conference fast approaching, STR, partnered with the Center for Terrorism and Security Studies (CTSS), is launching a series of guest blog posts, written by those who will be presenting their research at STR14. In the seventh installment of this series Jeff Weyers and Professor Jon Cole discuss their work applying the structured professional judgment tool known as the Identifying Vulnerable Persons (IVP) to extremist activity on social media. Jeff Weyers and Prof. Jon Cole are working on this project as members of the University of Liverpool Tactical Decision Making Research Group.