NFC greeting card

A system comprising:

• a plurality of unique URLs;
• for each URL, a physical card and a PIN, the PIN being removable from the card and the URL being fixedly associated with the card;
• a computing facility adapted such that:
• upon the delivery of a PIN, the computing facility delivers instructions to generate an interface to permit the delivery of content to the computing facility;
• upon the delivery of content to the computing facility using the interface, the computing facility associates the content with the URL for which the PIN was provided;
• upon any visit, by a phone
• to a URL of the plurality with which content has been associated, the facility delivers to said phone the content associated with the URL;
• and
• to a URL with which content has not yet been associated, the computing facility delivers to said phone instructions to permit the delivery of the PIN to the computing facility, such that, upon said delivery of the PIN, the computing facility delivers to said phone the instructions to generate the interface to permit the delivery of content to the computing facility from said phone;
• thereby to permit the creation of a card which permits an initial and subsequent recipients of the card to view content controlled by a sender of the card by removal of the PIN from the card by the sender prior to delivery of the card to the initial recipient.