They weren't sure if they'd ever meet, but the power of modern technology brought them together. Holocaust survivor Charlotte Adelman was only 9 years old when the Nazis invaded Paris in 1940. Family friends, the Quatrevilles, took Charlotte in and hid her in their cellar for nine months. More than 70 years later, Alain Quatreville sent her a Facebook message in an attempt to find out what happened to her and her family after War World II. The two finally reunited in a very poignant spot, the Wall of Names Holocaust memorial in Paris. They even went to the house Charlotte stayed in all those years ago.