1. A computer-implemented method comprising: under control of an electronic book reader device configured with executable instructions, performing the following: displaying content on a touch-screen display of an electronic book reader device; detecting pressure of an object on the touch-screen display of the electronic book reader device; detecting a duration of contact of the object with the touch-screen display of the electronic book reader device; initiating an operation in response to at least one of an amount of pressure applied by the object to the touch-screen display, a placement of the object on the touch-screen display, or the duration of contact of the object with the touch-screen display; and displaying results of the operation on the touch-screen display of the electronic book reader device.