1. A method for calculating at least one relationship metric of a relationship between objects, the method comprising the steps of: a) providing a multi-layered relationship network comprising at least: a first relationship layer derived from potential relations between objects, wherein potential relationships between objects are derived from semantic metrics related to said objects; a second relationship layer derived from interactions between objects, wherein interactions between objects comprise interactions of objects with content generated by other objects; a third relationship layer derived from explicit relations between objects, wherein explicit relations are relations defined by at least one of the objects; and an aggregated relationship layer derived from at least two layers of the first to third relationship layers; and wherein each layer comprises a graph comprising one vertex for every object represented in the multi-layered relationship network and at least one unidirectional and/or bidirectional edge between at least two of said vertices; b) calculating the weights of the edges of said aggregated relationship layer based on the weights of the edges of at least two relationship layers selected from the first to third relationship layers; c) selecting at least one relationship between an object and other objects related to said object from the aggregated relationship layer; d) outputting the calculated weights of the selected relationships as the calculated relationship metrics.