The exploitation of social media platforms by terrorist threat networks (TTNs) represents a critical challenge to national security that traditional counterterrorism frameworks struggle to address. This study examines how military information support operations (MISO) can be strategically leveraged to counter TTNs’ exploitation of these platforms for radicalization, recruitment, and operational planning. Through analysis of operational data and case studies from 2014–2024, this research demonstrates that current approaches face significant limitations, with response delays averaging 30 days, while terrorist content reaches millions within hours. The study employs a mixed-methods approach combining qualitative analysis of counterterrorism operations with quantitative assessment of social media data to evaluate the effectiveness of current countermessaging efforts. Based on empirical evidence demonstrating a 45% reduction in extremist content through coordinated response efforts, this research proposes establishing a strategic information support operations agency (SISOA) to coordinate countermessaging efforts, supported by advanced analytics and intelligence integration through OSINT, SOCMINT, and PUBINT capabilities. The findings indicate that strategic implementation of MISO, coupled with appropriate organizational structures and ethical guidelines, could significantly enhance counterterrorism effectiveness while preserving democratic values and civil liberties. This framework provides a model for balancing operational requirements with privacy protections in the digital age.