1. A computer-implemented method for identifying erroneous duplicate orders, the method comprising: receiving an indication of a current order placed by a user; automatically determining whether the current order is a duplicate with one or more prior orders that were previously placed by the user, the automatic determining being performed by one or more configured computing systems in a manner that is personalized to the user, wherein the manner personalized to the user differs from one or more other manners for automatically determining if other orders placed by other users are duplicates; when it is determined that the current order is not a duplicate, automatically proceeding to fulfill the current order without further intervention by the user, the automatic proceeding being performed by the one or more configured computing systems; and when it is determined that the current order is a duplicate, querying the user to obtain manual confirmation before proceeding to fulfill the current order.