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A presence service enables the discovery and retrieval of, and subscription to changes in, an end user's context information. RESTful web services are now emerging as a lighter alternative to the so-called Big Web services. This article presents an early feasibility prototype of a RESTful web-services-based architecture. The architecture enables the discovery and retrieval of and subscription to changes in context information, independent of the technologies used in the end users' domains. Concretely, it enables end users with multiple presence accounts (e.g., MSN, Yahoo, Gmail) to publish context information related to the account(s) they are using at any given time. It also enables other end users or applications to retrieve this information by subscribing to any of the multiple accounts of the publisher. The project has demonstrated that RESTful web services are quite suitable for bridging services across …