A facility for identifying users to whom to promote a selected auction is described. The facility maintains a representation of bidding histories of a plurality of users. At a point at which certain users have already bid in the selected auction, the facility identifies users that have not already bid...http://www.google.com/patents/US7318042?utm_source=gb-gplus-sharePatent US7318042 - Selecting prospective bidders to whom to promote an online auction based upon bidding history
