As smartphones and other mobile computing devices have increased in ubiquity,
advertisers have begun to realize a more effective way of targeting users and a
promising area for revenue growth: location-based advertising. This trend brings
to bear new questions about whether or not users will adopt products involving
this potentially invasive form of advertising and what sorts of protections should
be given to users. Our real-world user study of 27 participants echoes earlier findings
that users have significant privacy concerns regarding sharing their locations
with advertisers. However, we examine these concerns in more detail and find that
they are complex (e.g., relating to not only the quantity of ads, but the locations
they receive them at). With advanced privacy settings users stated they would feel
more comfortable and share more information than with a simple opt-in/opt-out
mechanism.