1. An electronic device comprising: a processor; and a memory including computer program code, wherein the memory, computer program code and processor are configured: to enable definition, by a user of the electronic device, of user-defined information that is defined by the user to be accessed by multiple users; to enable specification of a first image; to enable linking, according to specification of the user, the user-defined information via a first image key, created by digital image processing at least a first portion of image content of the first image; and to use a second image that includes a portion corresponding to at least the first portion of the first image to cause creation of a second image key by digital image processing of the image content of the second image and determination of a matching correspondence between the second image key and the first image key to enable access to the user-defined information linked via the first image key.