There are a number of teaching technologies other than LEARN that you can use to facilitate peer editing, close textual reading, and student interaction. For example, Microsoft Teams can be used for remote delivery, chatting with students, in-class polls, and peer reviewing. You can request a Microsoft Team that is synched with your class list, so that when students are added or when students withdraw from the class, the Team's enrolment is automatically updated.
Some of these additional educational technologies are directly supported by the university, and others are not. Incorporating additional technology can help achieve particular pedagogical outcomes and objectives, but keep in mind that each new platform adds to the complexity of the class for both the students and instructor.
See the university's Educational Technology Hub for tools that are centrally supported by the university, and see the UWaterloo Keep Learning site's Tools and Technology page for additional tools that are available but that the university doesn't centrally support.
Using Twitter in the Classroom
The worksheets for Tommy Mayberry's Using Twitter in the Classroom workshop are also available if you're thinking about incorporating other social media into your classes.