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ABSTMCTWowledge communities of ti kinds have social ad material practices for deciding what is known and who is to be -h ti paper, we address a spec%c kind of knowledge work environrnenti planning, and a partictdar form of coflaboratio~tie sharing ofmeasurement data sets. We xe interested in how trust is create~how trustab%ty is assessed in the arrn's-length co~aboration of sharing data sex and how changes in technolo~intemct tith those practices of~LWe look at seveti elements of scientic pmctice that ficfitate this sharing -communities of practice, boundary objects, and assemblages -and discuss the impficntions for CSCW, digiti fibraries, and other tiormation-sharing applications.

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What is the future of digital imaging? Mobile imaging technologies have been changing rapidly and will continue to do so. We explore new developments in cameraphone photography with the goal of improving the design of the next generation of mobile imaging devices. We equipped 26 diverse participants with cameraphones, photo uploading and sharing software, and access to online photo-accounts for 3-5 months. This study allowed us to identify emerging practices in mobile photoware. We report on new and continuing practices across the lifespan of photos in this new imaging environment, including image capture, upload, annotation, archiving, sharing, and viewing. Based on these results, we develop design criteria and implications for designers and makers of mobile devices, mobile imaging and sharing software, and desktop and online photo software.

a b s t r a c tIn this paper, I reflect on a specific product of interaction design, social networking sites. The goals of this paper are twofold. One is to bring a feminist reflexivity, to HCI, drawing on the work of Judith Butler and her concepts of peformativity, citationality, and interpellation. Her approach is, I argue, highly relevant to issues of identity and self-representation on social networking sites; and to the co-constitution of the subject and technology. A critical, feminist HCI must ask how social media and other HCI institutions, practices, and discourses are part of the processes by which sociotechnical configurations are constructed. My second goal is to examine the implications of such an approach by applying it to social networking sites (SNSs) drawing the empirical research literature on SNSs, to show how SNS structures and policies help shape the subject and hide the contingency of subject categories.