Abstract: A facility for enabling collaboration between users is disclosed. In various embodiments, the facility receives from a first user an indication of an information item that is associated with a pinboard collection and is to be shared with a second user, determines a server computing device associated with the second user, and when the server computing device that is associated with the second user is not also associated with the first user, replicates the indicated information item to the determined server computing device.

Abstract: A facility for creating shareable pinboard collections is described. In various embodiments, the facility receives an indication of a query defining a term for searching, employs a search provider to perform a search for information items matching a criteria, receives from the search provider an indication of a result corresponding to the query, creates a shareable pinboard collection, receives via a single action an indication to add the result to the shareable pinboard collection, and shares the shareable pinboard collection with a recipient.

Abstract: A facility for applying access control permissions is disclosed. In various embodiments, the facility receives an indication of an item for which to modify access control permissions, determines a set of items related to the indicated item, caches a set of relationships between the indicated item and the determined set of items, computes access control permissions for the indicated item, and applies the computed access control permissions to the indicated item when the computed access control permissions are different from the access control permissions actually applied on the indicated item.

Abstract: A facility for creating a shareable pinboard collection is disclosed. In various embodiments, the facility receives from a user a selection of one or more search providers, employs the selected one or more search providers to perform a search for information items matching a criteria specified by the user, and receives an indication of information items located by the selected one or more search providers.