  Social media presents an opportunity for people to share content that they
find to be significant, funny, or notable. No single piece of content will
appeal to all users, but are there systematic variations between users that can
help us better understand information propagation? We conducted an experiment
exploring social media usage during disaster scenarios, combining
electroencephalogram (EEG), personality surveys, and prompts to share social
media, we show how personality not only drives willingness to engage with
social media but also helps to determine what type of content users find
compelling. As expected, extroverts are more likely to share content. In
contrast, one of our central results is that individuals with depressive
personalities are the most likely cohort to share informative content, like
news or alerts. Because personality and mood will generally be highly
correlated between friends via homophily, our results may be an import factor
in understanding social contagion.
