Interesting post. From the metadata of a person's photos, you can extract, inter alia: ...whether they took some photos from a plane or helicopter (viewshed,

Interesting post. From the metadata of a person's photos, you can extract, inter alia: ...whether they took some photos from a plane or helicopter (viewshed, angle and altitude are preserved); ...how conscientious someone is (by looking at their iPhone's uptime, perhaps the over-conscientious person with an extreme uptime is borderline OCD?).