1. A system comprising: one or more processors; a display; and one or more computer-readable media storing a user context module, which when executed by the one or more processors cause the one or more processors to: display a customizable thumbnail on the display, the customizable thumbnail comprising function that enables extending functionality of the user interface, the function providing access to a combination of tiles in which at least one of the tiles describes at least one of a contact or an informational element, wherein: the function tracks or receives notifications related to at least one of the contact or the informational element, and displays at least one notification related to at least one of the contact or the informational element by representing the at least one notification on the combination of tiles.