1. A method of determining user interest estimations comprising: determining a threshold disinterest value; determining a graph based information structure containing at least two nodes; determining at least one interesting node in the graph based information structure; for each of the at least one interesting nodes; determining a set of active nodes based on the at least one interesting nodes; repeatedly adding adjacent connected nodes to the set of active nodes, based on the Degree-Of-Interest value and the determined threshold disinterest value.