Curiosity, got the best of me and I took a look at this thread. For some reason a good percentage of the photos do not have any shadows. not the people being photographed, nor the landscapes around them.
Either
All of these photos are taken at high noon, all over the word
All of these photos are taken only on very overcast / cloudy days ( even though you can see the sun )
All of these persons are Vampires ( day walkers )
All of these photos have gotten a little professional creative help