In embodiments of private interaction hubs, a mobile device has memory storage to maintain hub data that is associated with a private interaction hub, where the hub data includes multiple types of displayable data that is editable by different types of device applications. The memory storage at the device also maintains private data that is displayable and is viewable with one of the device applications. The mobile device also includes a display device to display the multiple types of the hub data in a hub user interface of a hub application. The display device can also display the private data and a subset of the hub data that are both associated with a device application in a device application user interface.