Mental health conditions, together with substance-use disorders, account for a significant share of the global disease burden (Collins et al., 2011;Vos et al., 2012). This share is particularly large among the population aged 10-24, and has significantly increased over time between 1990 and 2017. 1 Further, women are almost twice as likely as men to experience episodes of depression (DeRubeis et al., 2008; WHO, 2000). The economic costs of poor mental health are large. The World Health Organization estimates the current cost to the global economy of depression and anxiety to be around US$ 1 trillion per year in lost productivity (Patel et al., 2016; WHO, 2019) 2 and a large body of evidence highlights the negative consequences of mental illness on individual economic outcomes. 3 Yet, despite the significant societal and economic burden of mental health disorders, to date relatively little is known about the determinants of mental health and factors affecting psychological well-being over the lifetime. Recently, attention has been drawn to the role of Internet and mobile technologies in contributing to the rise of mental disorders, especially among the population of young adults. 4 The scientific evidence on the effect of these new technologies is however scant. In this paper, I aim to fill this gap in the literature and look at the causal effect of broadband Internet access on self-reported mental health, and the role of technology in contributing to the gender gap in mental health.