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Felicity downloads 10,000 JPEGs from a social
network website. By examining the camera serial numbers in the
images he is able to determine which images were shot by the same
camera. She then shows that he can reconstruct the ``friends''
networks--and shows which pseudonyms are sharing the same
camera, indicating that they might be living together or might be the same person.
Simson L. Garfinkel
2008-03-21