A system for the categorisation of interlinked information items, the system comprising: a trust flow module which is configured to receive a seed trust list of one or more first information items, the seed trust list associating the one or more first information items with one or more categories; and a trust flow module configured to: associate a respective trust value with each of the one or more categories for the one or more first information items; and iteratively pass at least part of the or each trust value to one or more further information items to generate, for each of the one or more further information items, at least one accumulated trust value associated with a category of the one or more categories, a user interface configured to: display the whole or part of the interlinked information items represented by nodes and to show or hide nodes based on the accumulated trust values associated with the category; or receive a user query in the form of a domain name, sub-domain name, website, webpage, or address of a webpage; provide an indication of the category and associated accumulated trust value, associated with the user query; using the trust flow module, allow a user to select the category; and display information about how the categorisation was made, wherein iteratively passing at least part of the or each trust value includes: in a first step, passing at least part of the or each trust value to the or each further information item to generate the at least one accumulated trust value for each of the one or more further information items, and in a second step, passing at least part of the or each accumulated trust value to one or more respective daughter information items of the one or more further information items and passing at least part of the or each trust value to the or each further information item to be combined with the respective at least one accumulated trust value, such that the one or more further information items can be categorised based on the at least one accumulated trust value and associated category. a trust flow module which is configured to receive a seed trust list of one or more first information items, the seed trust list associating the one or more first information items with one or more categories; and a trust flow module configured to: associate a respective trust value with each of the one or more categories for the one or more first information items; and associate a respective trust value with each of the one or more categories for the one or more first information items; and iteratively pass at least part of the or each trust value to one or more further information items to generate, for each of the one or more further information items, at least one accumulated trust value associated with a category of the one or more categories, a user interface configured to: display the whole or part of the interlinked information items represented by nodes and to show or hide nodes based on the accumulated trust values associated with the category; or receive a user query in the form of a domain name, sub-domain name, website, webpage, or address of a webpage; provide an indication of the category and associated accumulated trust value, associated with the user query; using the trust flow module, allow a user to select the category; and display information about how the categorisation was made, wherein iteratively passing at least part of the or each trust value includes: in a first step, passing at least part of the or each trust value to the or each further information item to generate the at least one accumulated trust value for each of the one or more further information items, and in a second step, passing at least part of the or each accumulated trust value to one or more respective daughter information items of the one or more further information items and passing at least part of the or each trust value to the or each further information item to be combined with the respective at least one accumulated trust value, such that the one or more further information items can be categorised based on the at least one accumulated trust value and associated category. display the whole or part of the interlinked information items represented by nodes and to show or hide nodes based on the accumulated trust values associated with the category; or receive a user query in the form of a domain name, sub-domain name, website, webpage, or address of a webpage; provide an indication of the category and associated accumulated trust value, associated with the user query; using the trust flow module, allow a user to select the category; and display information about how the categorisation was made, in a first step, passing at least part of the or each trust value to the or each further information item to generate the at least one accumulated trust value for each of the one or more further information items, and in a second step, passing at least part of the or each accumulated trust value to one or more respective daughter information items of the one or more further information items and passing at least part of the or each trust value to the or each further information item to be combined with the respective at least one accumulated trust value, such that the one or more further information items can be categorised based on the at least one accumulated trust value and associated category.