, accelerometer and gyroscope. The user interface 610 includes one or more output devices 612 that enable presentation of media content, including one or more speakers and/or one or more visual displays. The user interface 610 also includes one or more input devices 614, including user interface components that facilitate user input such as a keyboard, a mouse, a voice command input unit or microphone, a touch screen display, a touch sensitive input pad, a gesture capturing camera, or other input buttons or controls. Furthermore, some the client devices use a microphone and voice recognition or a camera and gesture recognition to supplement or replace the keyboard. In some implementations, the client device includes one or more cameras, scanners, or photo sensor units for capturing images not shown. Optionally, the client device includes a location detection device 616, such as a GPS global positioning satellite or other geo location receiver, for determining the location of the client device. The memory 606 includes high speed random access memory, such as DRAM, SRAM, DDR SRAM, or other random access solid state memory devices; and, optionally, includes non volatile memory, such as one or more magnetic disk storage devices, one or more optical disk storage devices, one or more flash memory devices, or one or more other non volatile solid state storage devices. The memory 606, optionally, includes one or more storage devices remotely located from one or more processing units 602. The memory 606, or alternatively the non volatile memory within the memory 606, includes a non transitory computer readable storage medium. In some implementations, the memory 606, or the non transitory computer readable storage medium of the memory 606, stores the following programs, modules, and data structures, or a subset or superset thereof: an operating system 618 including procedures for handling various basic system services and for performing hardware dependent tasks;a network communication module 620 for connecting the client device 220 to other systems and devices e. g.