Who are We the People ONLINE? With the development of digital technology in contemporary democracies, many new digital methods have been applied to public participation. However, although digital participation can theoretically break the geographic boundaries, the cybersecurity issues also affect national security. In Taiwan, as an example, in recent years, the policy emphasizes digital democracy. However, there have been many noteworthy cases in the face of different cybersecurity challenges such as fake news and fake accounts from home and abroad, affecting elections and public orders. These situations may affect the trust of the community and national security. Thus, this article attempts to propose a framework from the perspective of ‘membership and exclusion’ to explore the questions about whether governments can and should set boundaries of the community of digital public participation based on the concerns of national security, and why or why not.