Methods, apparatuses, computer program products, devices and systems are described that carry out accessing at least one persona that includes a unique identifier that is at least partly based on a first user's device-identifier data and the first user's network-participation data; verifying the persona by comparing the first user's device-identifier data and the first user's network-participation data of the unique identifier to a second user's device-identifier data and the second user's network-participation data; and presenting the persona in response to a request for personal information.