Although currently a standalone application, Friendlee could
completely replace the default phone book to serve as a one-stop
organizer for one’s social life. Given that Friendlee handles so
much personal data, it is of utmost importance that it has a
transparent trust model, both towards the service provider and
among the users. To this end, we have designed a simple,
category-based permission system that allows users to fine tune
the amount of personal information that contacts belonging to
particular categories may see. While it is necessary for the server
backend to keep a record of users' calls and their personal context
information, appropriate (public key-based) encryption can be
applied to minimize the risk of a privacy breach.