—In Online Social Networks (OSNs), it can be difficult to maintain the context of a conversation or action, i.e. to know what the situation is and how to act appropriately. The resulting uncertainties may lead to privacy issues. We focus on one issue Context Collision in this paper, and motivate that a first step to address this issue is to help users… (More)
Social network site users are often confronted with invisible audiences. Although various settings for managing audiences are available, we argue that these do not always match the users' interpretations. This study explores the audience-management strategies of 18 young adults when categorizing their (invisible) audiences in Facebook, using card sorting as… (More)
The paper operationalizes the concept of privacy by design for social network sites (SNS), defined as evaluating and embedding privacy in the development and adjustment of SNS technology. More in particular we identify the necessary social requirements of SNS in order to optimize the privacy from a user perspective. For this, one of the application domains… (More)
In this paper we present a case study of a longitudinal in-situ observation that involves a new social application for mobile communication. Our study demonstrates the need for an adaptive approach to planning, design, and implementation that is responsive to emerging social and infrastructure conditions. This represents a shift from traditional… (More)
The presence of multiple audiences and the collapse of boundaries between them in Facebook make it difficult for users to know and to control who has access to their online contributions. Previous research has shown how visualizations of Facebook friends are useful , but mainly focused on the instrumental goal of controlling access. It is unclear, however ,… (More)
The paper explores the potential challenges in digital TV audience measurement and Internet audience measurement related to three important consequences of digitalisation: the convergence of media, the specialisation of media in relation to the differentiation of audiences and the shift in control from broadcasters to audience members.