They should have an image map over the faces and you can click on the face and then it goes to a form where you can add details about the person.
I love this idea; how does the sponsoring site ensure the quality of the user supplied data?
NPR will have to use other sources to verify the information people on the internet submit. They can build it so that the submitted information isn't publicly available until it's verified.
Perhaps if they get multiple people suggesting that a particular person is this person, then that may be a good indicator.