Interactive walk-up-and-use displays are spreading in a variety of settings where stand presentation situations are common. We contribute by characterizing a presentation situation and investigating specific design implications for presenters in this situation. We also introduce interface system that utilizes physics-modeled spherical content widgets for information browsing. The system includes dedicated features we developed to support presenters in content production and visualization. To investigate stand presentations and their support, we organized a field trial at an exhibition, collecting observational data from video analysis, interviews with presenters, and questionnaires from the audience and presenters. The field study confirms the importance of the presentation use case for public walk-up-and-use screens and points to dedicated design implications for simultaneous support for presenters and visitors, management of presentation territories, and personalization.

Many existing and emerging online systems allow people to share content and coordinate the exchange of goods and favors in local geographic settings. We present a qualitative case study of user experiences concerning exchange and reciprocity in local online exchange. Findings from eleven in-depth interviews (containing forty-nine separate exchange experiences) reveal an aversion to indebtedness and several user behaviors that lessen these negative feelings: (1) offering small tokens of appreciation to exchange partners, (2) understanding and accepting the indirect nature of generalized exchange, (3) managing expectations by framing offers and requests carefully, (4) minimizing efforts needed in exchange processes, and (5) bartering and exchanging for a third party. The paper contributes to our understanding of emergent behaviors and norms in local online exchange systems. We discuss design implications from these empirical insights that can help alleviate the discomfort of indebtedness and better encourage and sustain participation in systems of indirect reciprocity.

Interactive media technologies are increasingly designed to support an active life among senior citizens and not solely to diminish the effects of physical and cognitive decline. One aspect of active life in one's old age is engagement in creative "personal projects," such as new hobbies and reflection on past events. To our knowledge, research has not yet explicitly focused on the role of creative personal projects in senior citizens' media use. In our analysis of media diaries and contextual interviews with seven seniors, we focus on how interactive media technologies are involved in these projects. Proceeding from our findings, we provide suggestions on how to enhance creative personal projects with interactive media technology design.

The workload needed for managing privacy and publicness in current social network services (SNSs) is placed on individuals, yet people have few means to control what others disclose about them. This paper considers SNS-users' concerns in relation to online disclosure and the ways in which they cope with these both individually and collaboratively. While previous work has focused mainly on individual coping strategies, our findings from a qualitative study with 27 participants suggest that collaborative strategies in boundary regulation are of additional importance. We present a framework of strategies for boundary regulation that informs both theoretical work and design practice related to management of disclosure in SNSs. The framework considers disclosure as an interpersonal process of boundary regulation, in which people are dependent on what others choose to disclose about them. The paper concludes by proposing design solutions supportive of collaborative and preventive strategies in boundary regulation that facilitate the management of disclosure online.