A method includes receiving identification information with a first electronic device and via a network, wherein the identification information is unique to a particular user device accessing webpage content, determining whether the identification information matches an identifier of a plurality of identifiers stored in a memory associated with the first electronic device, generating a reliability metric based on the determining, and providing the reliability metric to a second electronic device different from the first electronic device via the network. In such methods, the reliability metric is accessible by at least one bidder during a real-time auction associated with the webpage content.