Social Media and Mental Health
利用Facebook在美国大学逐步推出的自然实验，发现社交媒体对学生心理健康有负面影响，并增加了因心理健康问题导致学业受损的可能性，机制是加剧了不利的社会比较。
We provide quasi-experimental estimates of the impact of social media on mental health by leveraging a unique natural experiment: the staggered introduction of Facebook across US colleges. Our analysis couples data on student mental health around the years of Facebook’s expansion with a generalized difference-in-differences empirical strategy. We find that the rollout of Facebook at a college had a negative impact on student mental health. It also increased the likelihood with which students reported experiencing impairments to academic performance due to poor mental health. Additional evidence on mechanisms suggests the results are due to Facebook fostering unfavorable social comparisons.