SOCIAL NETWORK DRIVEN INDEXING SYSTEM FOR INSTANTLY CLUSTERING PEOPLE WITH CONCURRENT FOCUS ON SAME TOPIC INTO ON-TOPIC CHAT ROOMS AND/OR FOR GENERATING ON-TOPIC SEARCH RESULTS TAILORED TO USER PREFERENCES REGARDING TOPIC

A machine-implemented social networking system includes a hierarchy tree containing topic nodes. New nodes are added as new topics emerge in online public forums. Each topic node can link to an on-topic real time chat room whose occupants are currently discussing the topic of the node. A node-seeking automated process operates in the background and seeks out nodes that currently have topics appearing to be the same as or similar to what topics the user appears to have in mind. Content browsing experience of the user is enhanced by addition of an invitations displaying subsystem that automatically invites him or her to co-compatible chat rooms currently discussing the topic(s) the user appears to have in mind.