Perusall is a social annotation tool that integrates with Canvas and facilitates student engagement. Perusall allows students and their instructors to collaboratively markup .pdf documents. Instead of reading a document and discussing it, Perusall brings the discussion to the text. Scoring and grading are done automatically. As a lecturer you can review the scores, and check marginal students scores by hand, saving you a lot of time. At the same time, Perusall helps to make sense of the many annotations by providing a confusion report and overviews of most upvoted comments and questions.