15. The system of claim 11 , further configured to: store a plurality of interest signature values in a database; and retrieve and display one or more users from the database having a predetermined rank or interest signature value for a query topic in response to a request regarding the query topic.
15. The system of claim 11 , further configured to: store a plurality of interest signature values in a database; and retrieve and display one or more users from the database having a predetermined rank or interest signature value for a query topic in response to a request regarding the query topic. 16. The system of claim 15 , wherein to retrieve and display one or more users the system is to: output one or more users with highest ranked interest signature values corresponding to the query topic.