Facial recognition targeting is a targeting technology allowing advertisers to target consumers by using facial recognition features.
For the moment, facial recognition is not used to recognize a same individual across different ad exposures, but to determine gender - or estimate age - before displaying an ad.
Facial recognition has been used in digital marketing context with digital billboards for experiments or advertising happenings.
In the future, facial recognition targeting may be used via webcams for advertising with Skype like applications.
A reportage dealing with facial recognition targeting: