User equipment may be used in forming communications links between users. A virtual communications channel may be maintained between users while adjustments are made to the type of communications traffic that is being conveyed over the link, the nature of the physical channels being used in the link, link bandwidth and other link attributes, user requirements, and other factors. Monitoring circuitry may be used to monitor factors such as the location of a device and other operating parameters. As circumstances dictate, the operation of the device may be adjusted in real time, while maintaining the virtual communications channel intact. User devices may automatically advertize their presence and may automatically detect nearby devices. Content items may be shared using online services.