This document discusses how enterprise architecture is evolving to incorporate social context and dynamics. It argues that the growing use of social technologies in the workplace requires rethinking roles, processes, and platforms to support a more networked organization. The core of enterprise architecture must now focus on how people connect through social objects, activities, networks and communities. It provides examples of how Cisco has leveraged social collaboration internally to increase productivity, growth and innovation. The document concludes by outlining principles of an "architecture of participation" to guide integrating social media into the enterprise.