An absorbent core comprises an elongate liquid holding formation with a peripheral edge. A repository stores a first user’s profile that includes the first user’s identifiers for multiple social networking websites and the first user’s master list of contacts. Related methods are also provided. The bar-code reading system is configured to read the bar code under the conditions in which the reading line of the image sensor and the direction of relative displacement of the card cross each other at a predetermined angle. The releasable attachment may be a suture that is severed by a pusher having a cutter therein.