1. A method for time-multiplexing the display of a plurality of selected documents, comprising: determining time-multiplexing criteria for displaying a plurality of selected documents associated with a concept on a time-multiplexed basis; providing display data associated with the plurality of selected documents for presentation on a webpage at an output device according to the time-multiplexing criteria, wherein the time-multiplexing criteria determines an order of display of the selected documents in a sequence of the selected documents and a time duration of display for each of the selected documents at a same location in the webpage at the output device, wherein the order of display of the selected documents in the sequence of the selected documents and the respective time duration of display for each of the selected documents at the same location in the webpage vary based at least in part on respective a costs per click or a click through rates associated with each of the selected documents, and wherein the providing display data associated with the plurality of selected documents includes: providing display data associated with a first document for presentation in the webpage for a first time duration determined by the time-multiplexing criteria, wherein the first document is displayed at a first location in the webpage along with content associated with the concept; determining a lapse of the first time duration; and providing display data associated with a second different document in the sequence order of display of the selected documents, the second document replacing the first document in the webpage at the first location based on determining the lapse of the first time duration.