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Location-Sharing Technologies: Privacy Risks and Controls
Any type of content formally published in an academic journal, usually following a peer-review process.
posted on 01.01.2009by Janice Y. Tsai, Patrick Gage Kelley, Lorrie Cranor, Norman Sadeh
Due to the ability of cell phone providers to use cell phone towers to pinpoint users’ locations, federal
E911 requirements, the increasing popularity of GPS-capabilities in cellular phones, and the rise of cellular phones
for Internet use, a plethora of new applications have been developed that share users’ real-time location information
online . This paper evaluates users’ risk and benefit perceptions related to the use of these technologies and
the privacy controls of existing location-sharing applications. We conducted an online survey of American Internet
users (n = 587) to evaluate users’ perceptions of the likelihood of several location-sharing use scenarios along with
the magnitude of the benefit or harm of each scenario (e.g. being stalked or finding people in an emergency).We find
that although the majority of our respondents had heard of location-sharing technologies (72.4%), they do not yet
understand the potential value of these applications, and they have concerns about sharing their location information
online. Most importantly, participants are extremely concerned about controlling who has access to their location.
Generally, respondents feel the risks of using location-sharing technologies outweigh the benefits. Respondents felt
that the most likely harms would stem from revealing the location of their home to others or being stalked. People
felt the strongest benefit were being able to find people in an emergency and being able to track their children.
We then analyzed existing commercial location-sharing applications’ privacy controls (n = 89). We find that while
location-sharing applications do not offer their users a diverse set of rules to control the disclosure of their location,
they offer a modicum of privacy.