1. A method comprising: monitoring one or more communication attributes of previous communication events involving device-to-device communications between a user of a communication device and other device users; determining a frequency of the communication events based on the monitored communication attributes for each of the contacts that are affiliated with the communication events; maintaining one or more sets of selectable contact identifiers corresponding to the other device users that are affiliated with the determined frequency of the communication events; and presenting at least one of the sets of selectable contact identifiers of the other device users to the user via the communication device.