  As "Big Data" has become pervasive, an increasing amount of research has
connected the dots between human behaviour in the offline and online worlds.
Consequently, researchers have exploited these new findings to create models
that better predict different aspects of human life and recommend future
behaviour. To date, however, we do not yet fully understand the similarities
and differences of human behaviour in these virtual and physical worlds. Here,
we analyse and discuss the mobility and application usage of 400,000
individuals over eight months. We find an astonishing similarity between
people's mobility in the physical space and how they move from app to app in
smartphones. Our data shows that individuals use and visit a finite number of
apps and places, but they keep exploring over time. In particular, two distinct
profiles of individuals emerge: those that keep changing places and services,
and those that are stable over time, named as "explorers" and "keepers". We see
these findings as crucial to enrich a discussion for the potentials and the
challenges of building human-centric AI systems, which might leverage recent
results in Computational Social Science.
