. >> reporter: in new jersey, 17-year-old aaron goodman is using new media to tell this old and terrifying>> how does being a holocaust survivor affect you today? >> i am very upset by the anti-semitism. >> i've been running this tiktok for about a year. and over this year, i've amas ed 450,000 to 500,000 followers. >> tattooing was just a way to keep track of us. >> this one-on-one interaction with the survivor is hard to find. >> it's my first picture when i came back. >> reporter: that survivor is aaron's 85-year-old grandmother tova friedman, one of the last remaining people who's alive after living through the horrors of the auschwitz concentration camp. a "new york times" bestseller was written about the story of her life "the daughter of auschwitz." >> when i first came to concentration camp, there was a smell that i couldn't understand what it was. i'd never smelled anything like that. and i said, mom, what is that? and she said to me, she pointed to the crematorium. she said to me, "those are the burning bodies that have been gassed." >> reporter: tova vividly remembers being sepa