Abstract: A method for selecting network documents as a medium for promotional content. The method comprises capturing a plurality of browsing sessions of a plurality of network users in a communication network, each the browsing session mapping consecutive access to a group of the plurality of network documents by one of the plurality of network users, clustering the plurality of network documents in a plurality of clusters according to the plurality of browsing sessions, selecting at least one of the plurality of clusters as a medium for promotional content, and outputting the at least one selected cluster.

Abstract: A system for detecting a local phenomenon, the system includes an interface for receiving queries information from a system for retrieving art related media, and a processor, configured to: (a) create a first local popularity chart, wherein the creating of the first local popularity chart includes enumerating, for each geographic area of a group of sampled geographic areas, identical query strings of queries that are included in a group of queries; (b) create a first global popularity chart, wherein the creating of the first global popularity chart includes enumerating identical query strings of the queries that are included in the group of queries; and (c) select at least one query string in response to a scoring of the query string at the first local popularity chart and to a scoring of the query string at the first global popularity chart; wherein the group of queries includes queries which were queried during a first period of time.

Abstract: A system for detecting a local phenomenon, the system includes an interface for receiving queries information from a system for retrieving art related media, and a processor, configured to: (a) create a first local popularity chart, wherein the creating of the first local popularity chart includes enumerating, for each geographic area of a group of sampled geographic areas, identical query strings of queries that are included in a group of queries; (b) create a first global popularity chart, wherein the creating of the first global popularity chart includes enumerating identical query strings of the queries that are included in the group of queries; and (c) select at least one query string in response to a scoring of the query string at the first local popularity chart and to a scoring of the query string at the first global popularity chart; wherein the group of queries includes queries which were queried during a first period of time.