11. The system of claim 8 wherein the received information relating to the topic of the chat session includes a current topic of the chat session of the first node.
11. The system of claim 8 wherein the received information relating to the topic of the chat session includes a current topic of the chat session of the first node. 12. The system of claim 11 wherein the memory device further includes instructions that, when executed by the processor, cause the processor to: select the parent node as the second node when the current topic is more closely related to the parent node.