Yes. In the Recap stage of every Exercise you can start a discussion thread. To begin a discussion thread, visit the Recap stage of your Exercise.
Scroll to the middle of the Recap stage. Here you'll see an area called Discussion & Feedback.
Type in a discussion prompt and select the green Submit button. This will kick off your discussion thread. Please note that both Learners and Instructors can begin discussions and anyone can reply to a thread.
Note: You will not receive email notifications when new discussion threads are created.