An introduction to computerized experience sampling in psychology
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CHI '03 Extended Abstracts on Human Factors in Computing Systems
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IEEE Pervasive Computing
Privacy policies as decision-making tools: an evaluation of online privacy notices
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Privacy and Rationality in Individual Decision Making
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Privacy practices of Internet users: self-reports versus observed behavior
International Journal of Human-Computer Studies - Special isssue: HCI research in privacy and security is critical now
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Prototyping and sampling experience to evaluate ubiquitous computing privacy in the real world
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A study on the value of location privacy
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Internet users' perceptions of 'privacy concerns' and 'privacy actions'
International Journal of Human-Computer Studies
MyExperience: a system for in situ tracing and capturing of user feedback on mobile phones
Proceedings of the 5th international conference on Mobile systems, applications and services
Measuring privacy loss and the impact of privacy protection in web browsing
Proceedings of the 3rd symposium on Usable privacy and security
Privacy diffusion on the web: a longitudinal perspective
Proceedings of the 18th international conference on World wide web
From spaces to places: emerging contexts in mobile privacy
Proceedings of the 11th international conference on Ubiquitous computing
Anatomy of the long tail: ordinary people with extraordinary tastes
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Americans' attitudes about internet behavioral advertising practices
Proceedings of the 9th annual ACM workshop on Privacy in the electronic society
Privad: practical privacy in online advertising
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For sale : your data: by : you
Proceedings of the 10th ACM Workshop on Hot Topics in Networks
Indirect content privacy surveys: measuring privacy without asking about it
Proceedings of the Seventh Symposium on Usable Privacy and Security
Detecting and defending against third-party tracking on the web
NSDI'12 Proceedings of the 9th USENIX conference on Networked Systems Design and Implementation
Detecting price and search discrimination on the internet
Proceedings of the 11th ACM Workshop on Hot Topics in Networks
Proceedings of the 11th ACM Workshop on Hot Topics in Networks
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Most online service providers offer free services to users and in part, these services collect and monetize personally identifiable information (PII), primarily via targeted advertisements. Against this backdrop of economic exploitation of PII, it is vital to understand the value that users put to their own PII. Although studies have tried to discover how users value their privacy, little is known about how users value their PII while browsing, or the exploitation of their PII. Extracting valuations of PII from users is non-trivial - surveys cannot be relied on as they do not gather information of the context where PII is being released, thus reducing validity of answers. In this work, we rely on refined Experience Sampling - a data collection method that probes users to valuate their PII at the time and place where it was generated in order to minimize retrospective recall and hence increase measurement validity. For obtaining an honest valuation of PII, we use a reverse second price auction. We developed a web browser plugin and had 168 users - living in Spain - install and use this plugin for 2 weeks in order to extract valuations of PII in different contexts. We found that users value items of their online browsing history for about ∈7 (~10USD), and they give higher valuations to their offline PII, such as age and address (about 25∈ or ~36USD). When it comes to PII shared in specific online services, users value information pertaining to financial transactions and social network interactions more than activities like search and shopping. No significant distinction was found between valuations of different quantities of PII (e.g. one vs. 10 search keywords), but deviation was found between types of PII (e.g. photos vs. keywords). Finally, the users' preferred goods for exchanging their PII included money and improvements in service, followed by getting more free services and targeted advertisements.