One example embodiment relates to a method that comprises receiving, via a first portable electronic device, contextual information and a geolocation relating to a first user in a network-based system; receiving, via 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; and 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.