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.
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. 14. The method of claim 13 , wherein the policy engine determines a score based on the votes and updates the placement of the at least one of the plurality of content items in the global hierarchy of folders based on the score.