In 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.

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.

As cameraphones become the dominant platform for consumer multimedia capture worldwide, multimedia researchers are faced both with the challenge of how to help users manage the billions of photographs they are collectively producing and the opportunity to leverage cameraphones' ability to automatically capture temporal, spatial, and social contextual metadata to help manage consumer multimedia content. In our Mobile Media Metadata 2 (MMM2) prototype, we apply collaborative filtering techniques to automatically gathered contextual metadata to infer the likely sharing recipients for photos captured on cameraphones. We show that while current cameraphone sharing interfaces are fraught with difficulty, it is possible to use a context-aware approach to make the sharing of cameraphone photos simpler and more satisfying for users. Based on our analysis of the relative contributions of different cameraphone sensors to predicting the likely recipients for photos, we discover for our user population that the temporal context of photo capture proved highly predictive of photo sharing behavior.

Wowledge 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 ~L We 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.Ke~ords fiowledge u'or~enviromnenti plamting, boundary objects, assemblages, communities of practice, data sets, digiti kiraries, UC Berkeley Dim Library lNTRODUC~ON Technology desi~ed to support work has to be consonant ~~titbacti work practices.CSCW is e~ficitiy concerned ujth the socifly-ormd practices of users, as we~as with technologi~support for those practices.hluch CSCW research and design has been directd at stnti, stable, heterogeneous groups with on-going org-oti andor task connections [e.g.1S, 164, et d].Even when membership in the group is fily lmge, it is, or is assumed to be, tited andor know e.g.people working on a projec~within an ormtio~or as part of a professional community.However, much cooperative work is performed by large, heterogeneous, sfig, transient groups,distributed in time and space, with permeabIe bounties.Permimion to make di~bl or hard copies of all or part of this \vork for paonal or classroom use is granted without fee provided that copies are not made or dism%utedfor profit or commercial ad%=tage and that copiesbear this notice and the fill citation on the firstpaga To copy otim~is~to Tepublish,to post on senrers or to rdlsm%ute to ~its, requires prior specific perrnision an&'ora f= CSC\V 98 Seattle IVxtington USA Cop~ti@t ACLI 199S 1-5S1134094/9S/1 I...00OO.