13. The method of claim 1 , wherein the first user's interactions and the interactions of at least one other user include respective votes concerning the placement of at least one of the plurality of content items in the global hierarchy of folders.
1. A computer-implemented method comprising: receiving, via a network at a first client computer, a plurality of content items from one or more content sources, wherein each of the plurality of content items is a copy of a content item or a reference to a content item; presenting the plurality of content items in an organizational tool at the first client computer; receiving a first user's interactions with the plurality of content items via the organizational tool, wherein the first user's interactions comprise steps to organize the plurality of content items within a first local hierarchy of folders maintained by the organizational tool; and transmitting the first user's interactions, via the network, from the first client computer to a server computer, wherein a policy engine at the server computer determines whether to update a global hierarchy of folders comprising the plurality of content items based on the first user's interactions and interactions of at least one other user.