14. The computer program product of claim 13 , the storage medium further containing computer program code for performing the steps: determining a ranking of the candidate sponsored stories for the viewing user; and selecting at least one of the candidate sponsored stories based on the ranking.
21. The computer program product of claim 14 , the storage medium further containing computer program code for performing the steps: receiving a sponsored story specification from a sponsor, the sponsored story specification comprising one or more targeting criteria.