Digital technologies provide an historic opportunity to bring about a sea-change in the way we approach mental health. Because mobile technologies primarily collect data on human behavior, often in the context of their social relationships and interpersonal communications, they provide new opportunities for screening, tracking, and intervention, many of which are historically unique. For example, sensing using mobile and wearable computing (Harari et al., 2016) has the potential to transform our prediction of mental health states, and thus our capacity to provide timely and effective intervention to at-risk individuals.