Monitor topics of interest to a method and system

The present invention discloses a method and monitoring systems topics of interest, the method comprising: based on a first set of topics of interest involved in selecting a first set of said plurality of topics of interest or at least one key nodes critical nodes of the group; and a group monitoring the more critical nodes or publish content, to find a second set of topics of interest. According to various embodiments of the present invention, based on the first set of topics of interest to select a set of critical nodes participating in a first set of one or more topics of interest, as an object to be monitored, as compared to monitor all user node and reduces the number of nodes to be monitored published content, enabling efficient, low cost real time and find interesting subjects such as hot news or hot events.