A method for operating an electronic device with a touch-sensitive display, the method comprising: displaying a first application on a region of the touch-sensitive display, the first application being one of a plurality of concurrently open applications on the electronic device; while displaying the first application on the touch-sensitive display, detecting a first input; in response to detecting the first input, ceasing to display the first application on the touch-sensitive display and displaying a multitasking user interface that is configured to allow the selection of an open application for viewing and is also configured to allow the selection of one of a plurality of contactable users to communicate with, the multitasking user interface being displayed on the touch-sensitive display and including: a set of open application affordances, wherein activation of a respective open application affordance selects a corresponding open application in the plurality of concurrently open applications for viewing; a first set of contactable-user affordances, wherein activation of a respective contactable-user affordance initiates a process for communicating with a corresponding contactable-user; while displaying the multitasking user interface on the touch-sensitive display, detecting activation of a respective affordance in the multitasking user interface; and in response to detecting activation of the respective affordance: in accordance with a determination that the respective affordance is an affordance in the set of open application affordances that corresponds to a second application, displaying a user interface for the second application on the touch-sensitive display and ceasing to display the multitasking user interface on the touch-sensitive display; and in accordance with a determination that the respective affordance is an affordance in the first set of contactable-user affordances that corresponds to a first contactable-user, initiating a process for communicating with the first contactable-user, and while initiating the process for communicating with the first contactable-user, continuing to display the set of open application affordances for selecting an open application in the plurality of concurrently open applications. displaying a first application on a region of the touch-sensitive display, the first application being one of a plurality of concurrently open applications on the electronic device; while displaying the first application on the touch-sensitive display, detecting a first input; in response to detecting the first input, ceasing to display the first application on the touch-sensitive display and displaying a multitasking user interface that is configured to allow the selection of an open application for viewing and is also configured to allow the selection of one of a plurality of contactable users to communicate with, the multitasking user interface being displayed on the touch-sensitive display and including: a set of open application affordances, wherein activation of a respective open application affordance selects a corresponding open application in the plurality of concurrently open applications for viewing; a first set of contactable-user affordances, wherein activation of a respective contactable-user affordance initiates a process for communicating with a corresponding contactable-user; a set of open application affordances, wherein activation of a respective open application affordance selects a corresponding open application in the plurality of concurrently open applications for viewing; a first set of contactable-user affordances, wherein activation of a respective contactable-user affordance initiates a process for communicating with a corresponding contactable-user; while displaying the multitasking user interface on the touch-sensitive display, detecting activation of a respective affordance in the multitasking user interface; and in response to detecting activation of the respective affordance: in accordance with a determination that the respective affordance is an affordance in the set of open application affordances that corresponds to a second application, displaying a user interface for the second application on the touch-sensitive display and ceasing to display the multitasking user interface on the touch-sensitive display; and in accordance with a determination that the respective affordance is an affordance in the first set of contactable-user affordances that corresponds to a first contactable-user, initiating a process for communicating with the first contactable-user, and while initiating the process for communicating with the first contactable-user, continuing to display the set of open application affordances for selecting an open application in the plurality of concurrently open applications. in accordance with a determination that the respective affordance is an affordance in the set of open application affordances that corresponds to a second application, displaying a user interface for the second application on the touch-sensitive display and ceasing to display the multitasking user interface on the touch-sensitive display; and in accordance with a determination that the respective affordance is an affordance in the first set of contactable-user affordances that corresponds to a first contactable-user, initiating a process for communicating with the first contactable-user, and while initiating the process for communicating with the first contactable-user, continuing to display the set of open application affordances for selecting an open application in the plurality of concurrently open applications.