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Communication of one’s location as part of a social discourse is common practice, and we use a variety of technologies to satisfy this need. This practice suggests a potentially useful capability that technology may support more directly. We present such a social location disclosure service, Reno, designed for use on a common mobile phone platform. We describe the guiding principles that dictate parameters for creating a usable, useful and ubiquitous service and we report on a pilot study of use of Reno for a realistic social network. Our preliminary results reveal the competing factors for a system that facilitates both manual and automatic location disclosure, and the role social context plays in making such a lightweight communication solution work.