We all know someone who constantly posts selfies!

Frequently posting selfies on social media has been proven to increase narcissism in people, according to a new study.

Researchers monitored 74 adults between ages 18 and 34, measuring their level of narcissism using tests commonly used to diagnose Narcissistic Personality Disorder.

jenna marbles selfie GIF

The study found that participants who used social media frequently, particularly those who posted selfies, showed a 25 percent increase in narcissistic traits, with some even qualifying for Narcissistic Personality Disorder.

At the same time, those who were still on social media frequently, but sent tweets or posted text, exhibited no such increase in narcissistic traits.