Security for Social Media Login - Idea

Recently I received my SquareUp credit card reader.  During the signup, I was asked three security questions to verify my identity.

Why couldn't social networks take advantage of the unique information already stored for the user, in order to enhance security.

During login, or password recovery, the user would be shown three photos.  Two would be photos the user had previously tagged with names.  One would be a random photo.  The user would retag two of the photos with the correct names, and reject the unfamiliar photo.

Facebook, are you listening?

Security for Social Media Login - Idea