  In the modern digital world users need to make privacy and security choices
that have far-reaching consequences. Researchers are increasingly studying
people's decisions when facing with privacy and security trade-offs, the
pressing and time consuming disincentives that influence those decisions, and
methods to mitigate them. This work aims to present a systematic review of the
literature on privacy categorization, which has been defined in terms of
profile, profiling, segmentation, clustering and personae. Privacy
categorization involves the possibility to classify users according to specific
prerequisites, such as their ability to manage privacy issues, or in terms of
which type of and how many personal information they decide or do not decide to
disclose. Privacy categorization has been defined and used for different
purposes. The systematic review focuses on three main research questions that
investigate the study contexts, i.e. the motivations and research questions,
that propose privacy categorisations; the methodologies and results of privacy
categorisations; the evolution of privacy categorisations over time. Ultimately
it tries to provide an answer whether privacy categorization as a research
attempt is still meaningful and may have a future.
