Push notifications for the following cases:
Push notifications to mobile learners informing them of relevant updates in the discussion forums for courses they are enrolled in.
Currently, there are two desktop emails that do this:
a digest of activity in "followed" threads and
an email sent when there's a reply to a post that a learner made (applies to the first response to the original message in a thread only)
Recommended first step is to perform discovery on sending push notification equivalents of the two desktop use cases.