A method of managing chat services in a communications system comprising the steps of: a first user terminal initiating a chat session with a session manager; said first user terminal inviting a second user terminal to join the chat session, wherein the second user terminal is associated with a blacklist of blocked users that are blocked from communicating with the second user terminal; checking if a third user terminal invited to join the chat session by the first user terminal is listed in the blacklist; and in the event that the third user terminal is in the blocklist, creating a notification message to notify a user of the second user terminal that a blocked user is joining the chat session.