Twitter is widely used by undergraduate students, and this presentation offers a case study of its adoption to support students on three undergraduate modules. It considers the use of Twitter in-class to facilitate discussion, feedback and collaboration, particularly in large-group teaching, where discussion can be difficult to initiate and make inclusive. It also shows how Twitter provides great opportunities to extend traditional classroom boundaries, considering two ways in which this is so. First, it offers a replacement to email communication that promotes more collaborative, dialogue-based interaction, closer to that which occurs within the face-to-face classroom environment. Second, in so doing, it provides enhanced opportunities for continuous student feedback and intervention-based support. In short, we will see how Twitter encourages student engagement within and between classes, promoting students’ self-led, peer-supported learning.