Abstract: Non-traditional security challenges enabled by the social media in cyberspace have imposed a major threat on the national security and societal stability. The evolution of the cyber space is analyzed with a particular focus on the issues related to security and stability. The changes in the government's positions towards the cyberspace and online virtual societies are also briefly discusses. Then the evolution of author own conceptualization and understanding of the cyberspace are reviewed from a security perspective since 2004, and the need for a scientific framework is analyzed to examine these security challenges. The fact that an ACP-based social computing approach provides an effective framework to address those non-traditional security issues is argued for.