Nadav had warned Irmak in Camp 4 not to join the crowd cluttering Everest's face.
"All together on Facebook, Twitter and the website, we've got over 33, 000 people, " says Nadav.
"If you see any suspicious activity then you can share it to us and we create awareness, " says Nadav.
"It's like someone is taking a belt and putting it around your neck and pulling as hard as they can, " Nadav said.
It was Aydin Irmak, a 46-year-old Turk Nadav knew from base camp.
"We don't ever share rhino sightings because of the poaching, " explains Nadav.
Nadav Kander's images of China's Yangtze River depict communities adjusting to the changes caused by the re-routing of the country's largest river.
Nadav remembers the case of an American couple visiting Kruger on a mission to see a leopard for the first time in their lives.
Latest Sightings carries telephone numbers where people can directly report rhino poaching, says Nadav, who encourages his followers to keep an eye out for hunters.
Nadav immediately passed on the details to a park ranger in order to prevent the animal, which was bleeding around its neck, from becoming an easy target for hunters.
Looking ahead, Nadav says he'd like to expand the service to other game reserves so that he can improve the wildlife safari experience for tourists and help protect endangered species.
The solitary, elusive cat is one of the most difficult animals to spot in the wild, but thanks to the site, Nadav says, the couple got lucky on their first day at the park.
His remarkable feats have not gone unnoticed by the world -- Nadav has held meetings with Google executives and has been invited to speak about mobile applications and the internet at some of the biggest technology events in the continent, including the Tech4Africa conference.
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