Over one million Facebook users have signed up to help a 72 year-old Israeli Holocaust survivor locate his twin brother that he has not seen since the two were separated as four year-olds at Auschwitz.

ABC NEWS reports that Menachem Bodner has turned to the social media giant after months of frustration.

Bodner, who’s birth name is Elias Gottesman, changed his name after surviving the horrors of the Holocaust.

And while his brother’s given name is Jeno, Bodner says it is quite possible that his brother’s name has been changed, as well.

The one unmistakable link the two have are the successive numbers tattooed on their small arms when they arrived at Auschwitz.

Bodner’s stamp reads No. A7733. His identical twin brother’s stamp reads No. A7734.