A social-networking system, which may include a social-networking website, may enable its users (such as persons or organizations) to interact with it and with each other through it.  The social-networking system may, with input from a user, create and store in the social-networking system a user profile associated with the user.  The user profile may include information that the user has entered.  The information may be public or private, depending on the user's privacy settings, and may include, communication-channel information, and.  The social-networking system may also, with input and permission from a user, as well as provide services (e.g., wall posts, photo-sharing, event organization, messaging, games, or advertisements) to facilitate social interaction between or among users. 
The social-networking system may send over one or more networks content or messages related to its services to a mobile or other computing device of a user.  A user may also install software applications on a mobile or other computing device of the user for accessing a user profile of the user and other data within the social-networking system.  The social-networking system may generate a personalized set of content objects to display to a user, such as a newsfeed of aggregated stories of other users connected to the user. 
A mobile computing device—such as a smartphone, tablet computer, laptop computer, or dedicated audio/video communication interface—may include functionality for determining its location, direction, or orientation, such as a GPS receiver, compass, gyroscope, or accelerometer.  Such a device may also include functionality for wireless communication, such as BLUETOOTH communication, near-field communication (NFC), or infrared (IR) communication or communication with a wireless local area networks (WLANs) or cellular-telephone network.  Such a device may also include one or more cameras, scanners, touchscreens, microphones, or speakers.  Mobile computing devices may also execute software applications, such as games, web browsers, or social-networking applications.  With social-networking applications, users may connect, communicate, and share information with other users in their social networks.