iTunes U User Guide for web
View discussions in iTunes U for web
The Posts panes display discussions added to the current course. You can use the Posts panes to view all discussions added to the current course together or by a specific post.
View all discussions
In iTunes U
for web, click Posts > 
Discussions (private courses) for the discussions you want to view.iTunes U displays all discussions added to the current course, including general course discussions and discussions associated with a specific post. iTunes U displays discussions in the discussions list in reverse chronological order, by the initial discussion start date.
View discussions by post
In iTunes U
for web, click Posts > Recent Posts (in-session courses), Posts > All (in-session courses), Posts > All Posts pane (self-paced courses), or Posts > topic for the discussions you want to view.Click the post with the
discussions you want to view.