6. A system, comprising: one or more memories; one or more processors configured to execute instructions to perform operations, the operations comprising: providing a user interface including controls for enabling selection of targeting criteria by a content sponsor, the user interface including: a campaign tool for receiving input on campaign details, the campaign tool including: a search control configured to receive search strings and configured to provide, based on the received search strings: search results that represent one or more geographic areas and estimated reach information for each geographic area, wherein the estimated reach information for each geographic area indicates a number of unique users to be targeted within the geographic area, and a limited reach indicator based on a confidence level related to available estimated reach information; an add control configured to be presented with each search result and configured to, upon selection, add a geographic area associated with the respective search result to a campaign, an exclude control configured to be presented with each search result and configured to, upon selection, exclude the geographic area associated with the respective search result from the campaign, and a map control configured to be presented with each search result and configured to, upon selection, present a map of the geographic area associated with the respective search result.
6. A system, comprising: one or more memories; one or more processors configured to execute instructions to perform operations, the operations comprising: providing a user interface including controls for enabling selection of targeting criteria by a content sponsor, the user interface including: a campaign tool for receiving input on campaign details, the campaign tool including: a search control configured to receive search strings and configured to provide, based on the received search strings: search results that represent one or more geographic areas and estimated reach information for each geographic area, wherein the estimated reach information for each geographic area indicates a number of unique users to be targeted within the geographic area, and a limited reach indicator based on a confidence level related to available estimated reach information; an add control configured to be presented with each search result and configured to, upon selection, add a geographic area associated with the respective search result to a campaign, an exclude control configured to be presented with each search result and configured to, upon selection, exclude the geographic area associated with the respective search result from the campaign, and a map control configured to be presented with each search result and configured to, upon selection, present a map of the geographic area associated with the respective search result. 7. The system of claim 6 , wherein the reach information for each geographic area indicates the number of unique users to be targeted within the geographic area in a predetermined time period.