19. The method of claim 7 , wherein: in the step of obtaining access to the first database, the pluralities of features of the plurality of images associated with the entities are stored as first database feature vectors; and in the step of obtaining access to the second database, the plurality of features of the plurality of images associated with the generalized web locations are stored as second database feature vectors.
7. A method of alerting an entity to use of an image, the method comprising the steps of: obtaining access to a first database having a plurality of first database records, each of the first database records comprising at least: an identification of a corresponding one of a plurality of entities; and a plurality of features of a plurality of images associated with the entities; obtaining access to a second database having a plurality of second database records, each of the second database records comprising at least: an identification of a corresponding one of a plurality of generalized web locations; and a plurality of features of a plurality of images associated with the generalized web locations, the plurality of features being extracted from images obtained by crawling the generalized web locations; for at least one of the first database records, comparing corresponding ones of the features of a corresponding one of the images associated with a corresponding one of the entities to the plurality of features in the second database records to determine an identified entity of the plurality of entities; obtaining, from the identified entity, via a mechanism for expressing privacy preferences, at least one privacy preference comprising a visual query preference of the identified entity, wherein the mechanism provides for the identified entity of the comparing to express the privacy preferences to suppress a requester of the comparing from the receiving a visual query result that is associated with the identified entity, for the requester not being logged into an online account, or the requester not being in a social group of the identified entity, and further, the mechanism allows the individual subject of the query to express a preference for receiving an alert indicative of a use of the facial image of the identified entity in the second database records, and an online delivery address and frequency preference for the comparing and for receiving the alert; and advising the identified entity, corresponding to the at least one of the first database records, if the comparing yields a probable match.