Although a majority of young adults are members of at least one social networking site, peer reviewed research examining gender differences in social networking communication is sparse. This study examined gender differences in social networking, particularly for Facebook use, among undergraduates. A survey was distributed to 268 college students who were primarily freshmen (76%), female (53.3%), Caucasian (76.5%) with a mean age of 19.10 years (SD = 2.4). Minutes they reported daily on the internet, social networking, and Facebook were 217.2 (SD = 198.36), 117.2, (SD = 131.7), and 106.8 (SD = 120.3), respectively. Most (94%) had Facebook accounts. For Facebook users, gender differences were examined and females were more likely than males to report spending more time on Facebook than intended (p less than 0.0001); often losing sleep because of Facebook (p less than 0.0001); feeling closer to Facebook friends than those seen daily (p less than 0.0001); that Facebook pictures cause negative self body image (p less than 0.05); that Facebook use sometimes causes stress (p less than 0.05), and sometimes feeling addicted to Facebook (p less than 0.001). This research is important to better understand effect of social networking use on emotional health and to learn ways to help young adults deal with stressors that may accompany social networking use. (Contains 3 tables.)