How a forensic analysis of language reveals features of idiolect which can be used to identify criminals and terrorists online. Filmed Dec 2016 at The City of Stoke-on-Trent Sixth Form College. [Cameras (Staffs Uni): Oluseyi A Oluyinka; Giorgia Perini; Bob Straw; Tom Andrews; Ed Walker] [Editor (Staffs Uni): Carl Maddox] Born in Newcastle under Lyme, Harry Bradford was educated at Stoke on Trent Sixth Form College before studying English Literature and Language at Bangor University where he then specialised in Forensic Linguistics for his MSc. He currently works as a freelance Forensic Linguistic Consultant. This involves work on legal cases where the true identity or emotional state of a writer need to be determined. This often involves decoding texts or online posts to work out who wrote them and what their state of mind was at the time. Harry's talk considers the duality of online anonymity and the role that the field of Forensic Linguistics and linguistic profiling can play in shaping the future of the relationship between online discourse and surveillance. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at http://ted.com/tedx