An electronic device with a display and a touch-sensitive surface displays a user interface with a first electronic message, where the first electronic message is associated with corresponding message time metadata. While displaying the first electronic message, the electronic device detects only a single contact on the touch-sensitive surface and detect a first movement of only the single contact. In response to detecting the first movement of only the single contact, display message time metadata for the first electronic message adjacent to the first electronic messages, wherein the message time metadata was not displayed immediately prior to detecting the first movement of the single contact.