The importance of informal communication on the Internet has been increasing in recent years. Several systems for informal communication have been developed. These systems, however, require a particular server and/or specialized 3D contents. In this paper, we propose a system, named InCom, for informal communication in a 3D virtual environment. Browsers which are component of InCom generate 3D virtual worlds from existing common 2D HTML documents. Browsers communicate in a peer-to-peer manner. Using avatars makes gaze awareness smooth. Our results show that users shared interests by gaze awareness.