Method of social-fencing based on physical proximity

A method comprising:

• detecting by a first mobile device a communication conveyed by a second mobile device, wherein the second mobile device is within range of the first mobile device and the wherein the communication conveyed by the second mobile device includes an identifier that is unique to the second mobile device;
• retrieving, by the first mobile device, the identifier from the communication;
• and
• sending the retrieved identifier to a server;
• receiving the unique identifier at the server;
• searching stored data that maps identifiers to users;
• and
• generating, by the server, an alert responsive to determining the identifier corresponding to the second mobile device is associated with a given condition, wherein the given condition is associated with one or more rules regarding generation of alerts for designated individuals based at least in part on users associated with mobile devices.

A non-transitory computer readable storage medium comprising program instructions, wherein the program instructions are executable by a processor to:

• detect by a first mobile device a communication conveyed by a second mobile device, wherein the second mobile device is within range of the first mobile device and the wherein the communication conveyed by the second mobile device includes an identifier that is unique to the second mobile device;
• retrieve, by the first mobile device, the identifier from the communication;
• send the identifier to a server;
• receive the unique identifier at the server;
• and
• search stored data that associates identifiers to users;
• and
• generate an alert, by the server, responsive to determining the identifier corresponding to the second mobile device is associated with a given condition, wherein the given condition is associated with one or more rules regarding generation of alerts for designated individuals based at least in part on users associated with mobile devices.