It is almost impossible to avoid laptops, social media, emails, and smartphones.  Many of these technologies were developed to help organise our lives, while others promise to keep us fitter and happier for longer. But does all this technology have unintended consequences? David Ellis holds a 50th Anniversary Lectureship in Psychology at Lancaster University and an Honorary Research Fellowship at The University of Lincoln. Much of his work considers how recent methodological developments in technology and data collection (often referred to as digital traces) can reveal information about individuals and their behaviour. He has published on these topics in The Lancet Public Health, the International Journal of Neural Systems, Computers in Human Behavior, Cyberpsychology, Behavior and Social Networking and other journals. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at https://www.ted.com/tedx