Terrorists use cyberspace and social media technology to create fear and spread violent ideologies, which pose a significant threat to public security. Researchers have documented the importance of the application of law and regulation in dealing with the criminal activities in cyberspace. Using routine activity theory, this article assessed the effectiveness of technological approaches to mitigating the expansion and organization of terrorism in cyberspace. Data collection included open-source documents, government threat assessments, legislation, policy papers, and peer-reviewed academic literature and semistructured interviews with fifteen security experts in Nigeria. The key findings were that the new generation of terrorists who are more technological savvy are growing, cybersecurity technologies are effective, and bilateral/multilateral cooperation is essential to combat the expansion of terrorism in cyberspace. The data provided may be useful to stakeholders responsible for national security, counterterrorism, law enforcement on the choice of cybersecurity technologies to confront terrorist expansion in cyberspace.