Abstract: An electronic data sharing device configured to exchange a first tag with a corresponding tag from a further electronic data sharing device, wherein the first and second tags provide information that enables respective users of the electronic data sharing devices to share information via a server enabled internet-connected software system associated with the electronic data sharing devices, wherein the electronic data sharing device is either configured with a pre-shared key or is able to encrypt a session key, wherein the pre-shared key or session key are used to generate tags to ensure that: the electronic data sharing device and tags can only be made use of by the server.