'Grandiose' narcissists post photos of their progress toward health and fitness goals
A 2016 study published in the journal Social Networking recruited Instagram users under age 26 and had them complete the Five Factor Narcissism Inventory.
Results showed that "grandiose" narcissists — who are typically extroverted and attention-seeking — are more likely to post photos emphasizing their physical appearance. Specifically, they post photos highlighting their progress toward health and fitness goals.
[Photo via @khloekardashian]