Digital technologies increasingly impact nearly every aspect of our lives, affecting not only our well being but also changing the way we work, design policies, define morality, and even the way we think.   Every interaction with smartphones, computers and tablets leaves a leaves a trace, a digital footprint that offers fresh insights to psychologists studying the new frontiers of human behavior. At the same time, the use of public information provided by private citizens—social media postings, digital networks, datasets and internet preferences—requires careful attention to ethical considerations.   An especially timely book in light of the COVID-19 pandemic, when so many people were forced to live online like never before. Many of the changes, for individuals, workplaces, and societies, will be long-lasting.