Abstract: A network includes: at least a user terminal; a chat server; and at least a system for instant messaging. The system includes: a processor; memory; a chat engine; a control logic unit; and an input and output interface. The user terminal, the chat server, and the system are in communication with each other through instant messaging. A first user terminal is configured to send a message to a second user terminal indicating lack of privacy of the first user terminal when a first user of the first user terminal is logged in to the first user terminal, the first user being preregistered with a second user of the second user terminal. The second user terminal is configured to send a message to a third user and thereby notifying the third user of the lack of privacy of the first user terminal. A method for instant messaging is also provided.