Web 2.0 technologies such as Facebook, a popular social networking site, provide educators with new possibilities for reaching their students. As these technologies are new, there is not a total understanding of how these technologies could best be used in education. This study helps to develop this understanding by investigating how appropriate students find student-teacher interactions on Facebook. The results indicate that students find passive behaviors more appropriate than active behaviors with no difference depending on whether students or teachers perform the behaviors. Additionally, men find student-teacher interactions on Facebook more appropriate than women while no difference exists between undergraduate and graduate students, and age was not related to finding the interactions more or less appropriate.