L. Barkuus and A. Dey, “Location-based services for mobile telephony: a study of users’ privacy concerns,” in Prooceedings of the INTERACT’03, 2003. [PDF]
This paper present an interesting study of privacy concerns for location-based services. The author used a diary approach. They asked 16 participants to generate a 5-day journal in which they answer pre-specified questions about the usefulness and level of concern in using presented location-based services. A subset of participant was interviewed after completing the the journal for completing their entries. Also, the other interesting methodological approach that the author used was that of asking participants to imagine the existance of LBS services that would use or display their location.