A social network service, which can visualize and express a user's emotions or opinions and can randomly arrange or permanently delete the content of conversations exchanged between the user and counterparts includes: receiving a chat room creation request from at least one user equipment; transmitting information on a user equipment that has transmitted a chat room participation request, among at least one other user equipment located within a predetermined distance from the user equipment that has transmitted the chat room creation request, to the user equipment that has transmitted the chat room creation request; and creating a chat room for allowing the user equipment that has transmitted the chat room creation request and at least one other user equipment that has transmitted a chat room participation request to perform messaging communication.