Systems and a method are described. The method includes identifying and presenting a plurality of data items comprised of receiving a selection that identifies a parent category; identifying a first plurality of categories based on the parent category, the first plurality of categories including a first category, the plurality of data items not being user-classifiable under the first plurality of categories; identifying the plurality of data items based on a link from the first category to a second category, the second category being included in a second plurality of categories that are respectively associated with the first plurality of categories, the plurality of data items being user-classified under the second category; and communicating, over a network, a user interface response to the receiving the selection, the user interface including the plurality of data items.