Abstract: A method implemented by a server includes: sending a link short message (LSM) to a terminal; generating a communication token (C token) based on a link request of the terminal, and determining whether the server has stored another identical C token; when negative, storing the C token, and sending web data and the C token to the terminal; when affirmative, further determining whether a web cookie in the link request contains a browsing token identical to the C token; when affirmative, sending the web data to the terminal; and when negative, sending a verification short message (VSM) to the terminal, and sending the web data to the terminal upon receiving a verification request within a predetermined duration since sending the VSM.

Abstract: A method for establishing communication includes: in receipt of identification information associated with an outside party from an inside party, transmitting, by a closed server, link information to an outside party device associated with the outside party via a public server; in receipt of a request from the outside party device executing an instant messaging application, transmitting, by the public server, an identifier associated with a communication group to the outside party device; and in receipt of the identifier, adding, by the closed server, the outside party to the communication group and enabling the outside party to communicate exclusively with the inside party via an instant messaging service.