Exploring how we can harness our digital footprint in a more practical, and positive way. "The idea that an individual’s mental health can be inferred from their smartphone and internet usage is still in its infancy. But while we wait for the research trials to be conducted, we should reflect on the bigger question of what this means for all of us. In an era of data surveillance and ‘digital capitalism’, where our personal data is mined and collected for commercial purposes, we must give due consideration to the ethical and privacy issues surrounding this technology." Simon D’Alfonso, a lecturer in digital health at the University of Melbourne, examines the concept for Psyche magazine.