1. A server apparatus, comprising: a control block comprising at least one processor; at least one data reception unit operable to receive a request to share a picture; at least one storage facility, storing programmed instructions for execution by the control block, the programmed instructions defining an image analysis engine operable to determine that the picture comprises an image of a person; and at least one data transmission unit operable to issue a request to the person, or someone associated with the person, to consent to sharing the image; wherein the data reception unit is operable to receive a response to the request, and wherein the at least one storage facility stores programmed instructions defining an image processing unit operable to, if the response to the request indicates that consent to sharing the image is not given, modify the picture to obscure the image of the person.