A data processing device is disclosed, which selectively grants devices access to an online session if the devices satisfy a discovery range requirement. The online session is associated with the discovery range requirement by which the online session is selectively discoverable by the devices. The data processing device determines an access metric representing interactions related to the online session, and adjusts the discovery range requirement based on the determined access metric such that the online session is discoverable by more or fewer devices. The data processing device then selectively grants the devices access to the online session based on the adjusted discovery range requirement.