  Over the years, mobile phones have become versatile devices with a multitude
of capabilities due to the plethora of embedded sensors that enable them to
capture rich data unobtrusively. In a world where people are more conscious
regarding their health and well-being, the pervasiveness of smartphones has
enabled researchers to build apps that assist people to live healthier
lifestyles, and to diagnose and monitor various health conditions. Motivated by
the high smartphone coverage among young adults and the unique issues they
face, in this review paper, we focus on studies that have used smartphone
sensing for the well-being of young adults. We analyze existing work in the
domain from two perspectives, namely Data Perspective and System Perspective.
For both these perspectives, we propose taxonomies motivated from human science
literature, which enable to identify important study areas. Furthermore, we
emphasize the importance of diversity-awareness in smartphone sensing, and
provide insights and future directions for researchers in ubiquitous and mobile
computing, and especially to new researchers who want to understand the basics
of smartphone sensing research targeting the well-being of young adults.
