Nothing at all!

With no effort on your part, students can install the Blackboard Learn for the Facebook Platform, Blackboard Learn for the Apple iPhone and Blackboard Learn Toolbar applications and start getting access to their own Blackboard data in external services or devices.

However, you have the option of installing the Blackboard Sync Building Block to manage the authentication and access through the Building Block, as well as get reporting on usage. (More on the Blackboard Sync Building Block)