Abstract: The invention describes a query server and a computer-implemented method to provide a search service for finding online content. The query server may be incorporated in a system to provide the search service. A search query is received from a user and a set of sources of online content associated with said user is identified. The search query is output to said identified set of sources to generate search results from within said identified set of sources. The search results are then sent to said user.

Abstract: A system comprising a database of streams of online content and a processor for updating said database, the processor being arranged to receive a first user stream comprising a set of elements of online content together with an associated tag; determine whether or not said first user stream is to be added to the database by considering whether said associated tag meets predefined criteria; and update said database if said predefined criteria are met; wherein said updating step includes storing said first user stream in said database together with said associated tag and information identifying said first user.

Abstract: A method of establishing communication between a first and second terminal, the first terminal being arranged to communicate with a first communication system and the second terminal being arranged to communicate with a second communication system.

Abstract: A method of establishing communication between a first and second terminal, the first terminal being arranged to communicate with a first communication system and the second terminal being arranged to communicate with a second communication system.