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; determining a duration of time of contact of the object with the touch-screen display of the electronic book reader device; initiating an operation that is determined based on at least an amount of pressure applied by the object to the touch-screen display and the duration of time 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.