More than a million people around the world have told Frank Warren their deepest secrets. People have mailed him confessions, disappointments, and their hopes for the future. They do not tell Warren who they are. Warren shows his favorite postcards online and in exhibits. And he shares them with people in popular presentations. “Dear birth mother: I have great parents. I found love. I’m happy.” “I give decaf to customers who are rude to me.” “Everyone who knew me before 9/11 believes I’m dead.” Ten years ago Warren began what he thought would be a small social experiment. “I wanted to find out if people had secrets and if they did, if they’d share them with me. So I printed up 3,000 self-addressed postcards with my home address on one side and a blank space for them to write down a secret -- something they'd never told anyone before -- and decorate the card with artwork and mail it to my home.” Many people wrote their secrets on the card and mailed them to him. Warren put some of them on his website and published some of them in books. Soon, people from Ireland, Japan, South Africa, the United Kingdom, Greenland and Australia were writing their secrets on their own postcards and mailing them to him in different languages.