Facebook is a website with over one billion users worldwide that is synonymous with social-networking. However, in this study, Facebook is used as an "instructional network". Two sections of an undergraduate calculus course were used to study the effects of participating in a Facebook group devoted solely to instruction. One section was given the opportunity to participate in the group and the other was not. Based on test scores, homework scores, and survey results, it was found that students who actively participated in the Facebook group were more engaged in the course, more satisfied with the course, and performed at a higher level in the course than did students who did not actively engage in Facebook. Implications for using Facebook as an instructional network are discussed.