This study examined the effects of an instructor's use of video casting as a nonverbal emotional cue in synchronous discussion sessions on students' social presence, satisfaction, and learning achievement. A quasi-experimental design was used to evaluate the effect of video casting in a synchronous virtual classroom. The research setting was a 100% online master's degree program within a university located in the midwestern United States. Thirty-three students participated in the experiment. The results showed a significant positive effect of the video casting on students' feeling of instructor copresence. No significant effect of video casting was found on either students' satisfaction or learning achievement.