The user of a mobile entity with camera functionality uses it to capture an image item which the user then transfers to a networked service system for future access. To facilitate the sharing of the image item with persons who were nearby when the image item was captured, the user uses the mobile entity to form a viewer set of permitted viewers of the image item. The process of forming the viewer set involves the user selection of individuals from a group of persons identified as nearby by a wireless enquiry carried out by the mobile entity contemporaneously with image-item capture. Each viewer in the viewer set is then sent a message with access information for accessing the image item at the service system.