Tools for Achieving Usable Ex Post Transparency: A Survey <s> 6) SATISFACTION <s> Today's rich service offer in the World Wide Web increasingly requires the disclosure of personal user data. Service providers' appetite for personal user data, however, is accompanied by growing privacy implications for Internet users. Addressing this rising threat, privacy-enhancing technologies aim at aiding users in protecting their personal data. Even though effective privacy laws facilitate users to edit and revoke already disclosed personal data, few PET solutions support users in exercising this right. Available tools lack intuitive interfaces and are built on powerful infrastructures on the provider side. In this paper we introduce the Data Disclosure Log component within a user-centric privacy architecture. Built on a browser-based logging extension, we present a visualization tool that displays past personal data disclosures from different perspectives. A graph-based view allows for the dynamic presentation of relations between selected entity types. Such an overview enables users to know the conditions of past personal data transactions at any time. This knowledge represents a prerequisite for an ex post revision or revocation of personal data. Usability and user acceptance of the developed prototype is evaluated in a conducted user test. <s> BIB001 </s> Tools for Achieving Usable Ex Post Transparency: A Survey <s> 6) SATISFACTION <s> The rapid adoption of location tracking and mobile social networking technologies raises significant privacy challenges. Today our understanding of people's location sharing privacy preferences remains very limited, including how these preferences are impacted by the type of location tracking device or the nature of the locations visited. To address this gap, we deployed Locaccino, a mobile location sharing system, in a four week long field study, where we examined the behavior of study participants (n=28) who shared their location with their acquaintances (n=373.) Our results show that users appear more comfortable sharing their presence at locations visited by a large and diverse set of people. Our study also indicates that people who visit a wider number of places tend to also be the subject of a greater number of requests for their locations. Over time these same people tend to also evolve more sophisticated privacy preferences, reflected by an increase in time- and location-based restrictions. We conclude by discussing the implications our findings. <s> BIB002 </s> Tools for Achieving Usable Ex Post Transparency: A Survey <s> 6) SATISFACTION <s> Today's smartphone applications expect users to make decisions about what information they are willing to share, but fail to provide sufficient feedback about which privacy-sensitive information is leaving the phone, as well as how frequently and with which entities it is being shared. Such feedback can improve users' understanding of potential privacy leakages through apps that collect information about them in an unexpected way. Through a qualitative lab study with 19 participants, we first discuss misconceptions that smartphone users currently have with respect to two popular game applications that frequently collect the phone's current location and share it with multiple third parties. To measure the gap between users' understanding and actual privacy leakages, we use two types of interfaces that we developed: just-in-time notifications that appear the moment data is shared and a visualization that summarizes the shared data. We then report on participants' perceived benefits and concerns regarding data sharing with smartphone applications after experiencing notifications and having viewed the visualization. We conclude with a discussion on how heightened awareness of users and usable controls can mitigate some of these concerns. <s> BIB003 </s> Tools for Achieving Usable Ex Post Transparency: A Survey <s> 6) SATISFACTION <s> Location-Based Mobile Service (LBMS) is one of the most popular smartphone services. LBMS enables people to more easily connect with each other and analyze the aspects of their lives. However, sharing location data can leak people's privacy. We present PDVLoc, a controlled location data-sharing framework based on selectively sharing data through a Personal Data Vault (PDV). A PDV is a privacy architecture in which individuals retain ownership of their data. Data are routinely filtered before being shared with content-service providers, and users or data custodian services can participate in making controlled data-sharing decisions. Introducing PDVLoc gives users flexible and granular access control over their location data. We have implemented a prototype of PDVLoc and evaluated it using real location-sharing social networking applications, Google Latitude and Foursquare. Our user study of 19 participants over 20 days shows that most users find that PDVLoc is useful to manage and control their location data, and are willing to continue using PDVLoc. <s> BIB004
An ISO usability principle, satisfaction,  denotes personal comfort and encouragement, as well as the perceived usefulness of an application. A user experience that is entirely satisfying has the potential to entail an extended use of an application. The interviews conducted by Kolter et al. BIB001 with test persons that evaluated the usability of their TET showed that they ''understood and valued the advantages'' of the tool. The participants of the user study conducted by Abdullah et al.  attested to the usefulness of the browser extension that was developed, but some questioned its usefulness in a home environment. Most participants in the user study conducted by Balebako et al. BIB003 found the TET useful and would like to install it, or a similar app, on a mobile device. Likewise, the participants in the user studies conducted by Mun et al. BIB004 and Toch et al. BIB002 stated that the respective TET represented a useful tool for managing their data and were willing to use it in the future. Toch et al. report that about one third of the test subjects actually used the tool one month after the study had finished. The usability tests conducted for 'Data Track' ('GenomSynlig') showed that the majority of test users considered Data Track to be a potentially useful tool, appreciated its transparency options, and would use it on a regular basis. Hence, the perceived usefulness of ex post TETs seems to be high, which has been confirmed by the reported evaluation results in the surveyed publications.  Aesthetic (adjective): ''responsive to or appreciative of what is pleasurable to the senses''  30 Satisfaction (noun): ''a source or means of enjoyment''  VI. DISCUSSION 