Computer-readable media, computer systems, and computing methods are provided for employing abstract objects to solicit bids from advertisers and to present ads submitted by the advertisers upon a user invoking the abstract objects while conducting an online search. The abstract objects include entities, entity classes, actions, and tasks, which are mined by crawling storage locations on the Internet. These abstract objects are monetized by building an index with entries referencing the abstract objects and maintaining the index in a location accessible to advertisers. Via the index, the advertisers target the abstract objects and place bids thereon. During a user-initiated online search, the abstract objects that are relevant to a task being carried out by the user are identified. Further, ads submitted by advertisers that placed bids upon the identified abstract objects are selected for presentation. Based on the bids, the winning advertiser's ad is presented to the user.