<p>Since their invention in 1999, Emojis have become part of most people’s digital communication. Emojis have become part of most people’s digital communication. Increasingly, companies are mining the contents of social media posts to estimate information about social media users’ characteristics. The present research investigated relationships among gender, personality traits (i.e., Big Five, Dark Triad, and sensation seeking), and self-reported emoji use. We assessed the frequency of emoji use, gender, and personality traits in a study involving 285 undergraduates. Participants estimated how often they used 40 of the most commonly used emojis (i.e., 20 with positive meanings and 20 with negative meanings), the frequency of using emojis in new social media posts, replies to others’ social media posts, and text messages. The results showed that relationships among personality traits and emoji use differed for men and women. For men, those higher in Machiavellianism and mood instability/neuroticism reported using emojis the most. For women, those higher in narcissism used emojis the most. Overall, women used emojis more than men. Only six emojis were used more frequently by men than women (i.e., Pile of Poop, Fire, Exploding Head, Face Screaming in Fear, 100 Points, and Person with Folded Hands). The results are consistent with prior theories describing gender differences in emoji use. Implications for using emojis to estimate social media users’ personal characteristics are discussed.</p>