Dynamic geofence based on members within

A system comprising at least one module, executing on one or more computer processors, to perform operations comprising, at least:

• receiving, via a first portable electronic device, contextual information and a geolocation relating to a first user in a network-based system;
• receiving, via a second portable electronic device, contextual information and a geolocation relating to a second user in the network-based system;
• identifying a common element in the received contextual information relating to the first user, and the received contextual information relating to the second user, wherein the common element is not pre-identified and is identified upon a comparison of the first and second contextual information;
• in response to an identification of the common element, defining a boundary for a geofence based on the geolocation of the first or second users;
• automatically monitoring the geolocation of the first or second user;
• dynamically adjusting the boundary of the geofence based on the identified common element and a change in the geolocation of the first or second user;
• and
• redefining the boundary of the geofence to exclude at least one member from a population of the geofence, the exclusion based on an identified change in geolocation or contextual information relating to the at least one excluded member.

A non-transitory machine readable medium, including instructions, which when performed by a machine, causes the machine to perform operations including, at least:

• receiving, via a first portable electronic device, contextual information and a geolocation relating to a first user in a network-based system;
• receiving, via a second portable electronic device, contextual information and a geolocation relating to a second user in the network-based system;
• identifying a common element in the received contextual information relating to the first user, and the received contextual information relating to the second user, wherein the common element is not pre-identified and is identified upon a comparison of the first and second contextual information;
• in response to an identification of the common element, defining a boundary for a geofence based on the geolocation of the first or second users;
• automatically monitoring the geolocation of the first or second user;
• dynamically adjusting the boundary of the geofence based on the identified common element and a change in the geolocation of the first or second user;
• and
• redefining the boundary of the geofence to exclude at least one member from a population of the geofence, the exclusion based on an identified change in geolocation or contextual information relating to the at least one excluded member.