1. A data processing method for defining at least one relationship link between plural individuals, comprising the steps of: (a) enabling at least a portion of the plurality of individuals, to provide content data visible to the plural individuals; (b) labeling, by said at least a portion of plural individuals, of said content data with at least one tag element, said at least one tar element comprising data identifying at least one plural individual related to said content data; and (c) generating, based on said at least one tag element, the at least one relationship link between said plural individuals.