A system for facilitating collaboration among users via a network includes a server and user computers. Each user computer has a browser client configured with the server to provide collaborative services relative to applications invoked by users on the user computers. The browser clients and the server make available to each user computer, in web format, content from heterogeneous content sources, at least some content obtained via the applications. The browser clients are configured with the server to capture in a web layer and make available to the user computers explicit social information and implicit social information provided by the users via the browser clients using the collaborative services.