Location-aware mobile applications have become extremely common, with a recent wave of mobile dating applications that provide relatively sparse profiles to connect nearby individuals who may not know each other for immediate social or sexual encounters. These applications have become particularly popular among men who have sex with men (MSM) and raise a range of questions about self-presentation, visibility to others, and impression formation, as traditional geographic boundaries and social circles are crossed. In this paper we address two key questions around how people manage potentially stigmatized identities in using these apps and what types of information they use to self-present in the absence of a detailed profile or rich social cues. To do so, we draw on profile data observed in twelve locations on Grindr, a location-aware social application for MSM. Results suggest clear use of language to manage stigma associated with casual sex, and that users draw regularly on location information and other descriptive language to present concisely to others nearby.

We investigated ways to automatically analyze movement and verbal behavior of teams of soldiers engaged in simulated military missions. Analysis of location data revealed that soldiers' locations were consistent with 3 stationary patterns and 2 movement patterns. Analysis of their dialogue detected statistical regularities. An automated text classifier was developed that employed these regularities to code dialogue utterances. These analyses demonstrate the feasibility of interpreting collaborative activity automatically and constructing models of team context for teams of soldiers engaged in trained activities.

While social network capabilities are proliferating on many online services, research has focused on just a few popular social network sites. In this note, we consider a different kind of social network site, explicitly designed to support particular types of risky sexual activity among men who have sex with men (MSM). We consider the role of ambiguity built into the interface in how users manage self-disclosure and its association with articulating more friends-only or sexual connections on the site. Despite the site's explicit orientation toward risky sexual practices, we find indications that users mitigate potential public health issues through the practice of sero-sorting. We discuss how design considerations that may allow for easier entrance into a community can cause problems for long-term users, or generate potential public health issues.

We describe facets of specialized software applications developed to support a large collaborative engineering program. Although many of the applications were bespoke efforts, designed to the requirements of users, virtually all major applications have an unofficial spreadsheet or database backing up the official application. These tools invariably play a critical but unofficial role in the day-to-day work, acting as more than just as a work-around, while the official applications are used primarily for mandated record keeping and auditing purposes. Surprisingly, there is often management approval for these unofficial applications, but at the same time, desire to elimination these applications and only use the official applications. We discuss the implications of this finding for future collaborative applications and long-term record keeping.

We report on our experiences of introducing an instant messaging and group chat application into geographically distributed workgroups. We describe a number of issues we encountered, including privacy concerns, individual versus group training, and focusing on teams or individuals. The perception of the tool's utility was a complex issue, depending both on users' views of the importance of informal communication, and their perceptions of the nature of cross-site communication issues. Finally, we conclude with a discussion of critical mass, which is related to the features each user actually uses. More generally, we encountered a dilemma that imposes serious challenges for user-centered design of groupware systems

We report an empirical study of a synchronous messaging application with group-oriented functionality designed to support teams in the workplace. In particular, the tool supports group chat windows that allow members of a group to communicate with text that persists for about a day. We describe the experience of 6 globally-distributed work groups who used the tool over a period of 17 months. An analysis of use shows that the group functionality was used primarily for bursts of synchronous conversations and occasional asynchronous exchanges. The content was primarily focused on work tasks, and negotiating availability, with a smattering of non-work topics and humor. Nearly all groups were remarkably similar in the content of their group chat, although the research group chatted far more frequently than the others. We conclude with suggestions for future research, and a discussion of the place of team-oriented synchronous messaging tools in the workplace.