The Tao of Open Source Intelligence provides a comprehensive guide to OSINT (Open Source Intelligence) techniques, for the investigator: It catalogues and explains the tools and investigative approaches that are required when conducting research within the surface, deep and dark webs. It explains how to scrutinize criminal activity without compromising your anonymity and your investigation. It examines the relevance of cyber geography and how to get around its limitations. It describes useful add-ons for common search engines, as well as considering metasearch engines It considers deep-web social media platforms and platform-specific search tools, detailing such concepts as concept mapping, entity extraction tools, and specialist search syntax (Google kung fu). It gives comprehensive guidance on Internet security for the smart investigator