6 is a block diagram illustrating a representative client device 220 associated with a user account in accordance with some implementations. The client device 220, typically, includes one or more processing units CPUs 602, one or more network interfaces 604, memory 606, and one or more communication buses 608 for interconnecting these components sometimes called a chipset. Optionally, the client device also includes a user interface 610 and one or more built in sensors 690 e. g. , 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.