1. A method of assembling information, comprising the steps of: identifying properties of a target individual, comprising using a correlation processor to extract user identifiers from retrieved data items, and correlating the user identifiers from different web sites, thereby identifying properties of a target individual; building an initial social circle of the target individual by crawling a plurality of web sites from different social media providers to identify direct and indirect associations between users of the social media providers and the target individual, wherein the target individual has no direct connection with least one of the social media providers; deriving references to the target individual from the direct and indirect associations; and compiling a dossier on the target individual from the references to the target individual.