When recording their GPS trajectories or posting geo-tagged
content on social networks, people produce social spatio-
temporal data that can be stored and shared, namely geoso-
cial data. Much of these spatio-temporal data can be used
by organizations and applications, for statistical analysis or
to provide services that are based on data. By letting peo-
ple sell the data they produce, to dierent consumers, both
sides can benet. Thus, we present here a visionary idea of
a geosocial marketplace where people and organizations can
sell, buy and exchange geosocial data, that is, trade with
spatio-temporal data pertaining people. We discuss the in-
volved challenges, such as how to dene supply and demand,
pricing data, privacy issues and measuring the amount of
data being exchanged. We explain the importance of the
approach and its applicability. We believe that the pro-
posed vision could motivate followup research in the area
of sharing and exchanging spatio-temporal data as well as
determining appropriate price points.