An instant messaging system for providing transparent participation of third parties in instant messaging, the system comprising: a first server and a second server configured to create a first chat session between a first chat party and a second chat party, communication in the first chat session being bidirectional between the first chat party and the second chat party, the first chat session being a sub-chat of a chat thread, the first server is further configured to create a second chat session between the first chat party and a third chat party, communication in the second chat session being bi-directional between the first chat party and the third chat party, the second chat session being another sub-chat of the chat thread, the third chat party enabled to passively participate in the first chat session while actively communicating with the first chat party, and the third chat party and second chat session being transparent to the second chat party.