The current World Wide Web is essentially a network of documents, a continuously evolving information universe. But the potential of internetworking goes far beyond information access, its use for human interaction being at least as important. As the Web is becoming a ubiquitous part of everyday life, many applications that support human interaction have become available as well. Unfortunately, they are only ad hoc additions to the document-focused Web. This paper explores the concept of an Inhabited Web, a conceptual extension of the document-centered Web to explicitly support not only documents but also social interaction and to extend human presence from sporadic, chaotic, and isolated to ubiquitous and regulated. KEYWORDS Architecture, Computer-Mediated Communication, Groupware, Ubiquitous Computing, Virtual Communities.