In the context of a myriad of mobile apps which collect personally identifiable information (PII) and a prospective market place of personal data, we investigate a user-centric monetary valuation of mobile PII. During a 6-week long user study in a living lab deployment with 60 participants, we collected their daily valuations of 4 categories of mobile PII (communication, e.g. phonecalls made received, applications, e.g. time spent on different apps, location and media, e.g. photos taken) at three levels of complexity (individual data points, aggregated statistics and processed, i.e. meaningful interpretations of the data). In order to obtain honest valuations, we employ a reverse second price auction mechanism. Our findings show that the most sensitive and valued category of personal information is location. We report statistically significant associations between actual mobile usage, personal dispositions, and bidding behavior. Finally, we outline key implications for the design of mobile services and future markets of personal data.
People of all ages are increasingly exposed to online environments that encourage them to share and connect with others. However, there is a perception that adolescents are particularly susceptible to these cues and share more online than do other age groups. With a group of 288 adolescents and 285 adults, we explored differences and similarities in use of Facebook for information sharing and use of the controls to protect their privacy. Adolescents reported disclosing more information on Facebook and using the privacy settings less than adults. Despite these differences, the results indicated that adolescents and adults were more similar than different in the factors that predicted information disclosure and control. Adolescents spent more time on Facebook, which partially mediated the relationship between group (adolescents vs. adults) and disclosure. Self-esteem partially mediated the relationship between group and information control, with adults having higher self-esteem than adolescents.  Individuals communicate and form relationships through Internet social networking websites such as Facebook and MySpace. We study risk taking, trust, and privacy concerns with regard to social networking websites among 205 college students using both reliable scales and behavior. Individuals with profiles on social networking websites have greater risk taking attitudes than those who do not; greater risk taking attitudes exist among men than women. Facebook has a greater sense of trust than MySpace. General privacy concerns and identity information disclosure concerns are of greater concern to women than men. Greater percentages of men than women display their phone numbers and home addresses on social networking websites. Social networking websites should inform potential users that risk taking and privacy concerns are potentially relevant and important concerns before individuals sign-up and create social networking websites.