The Kojo Nnamdi Show

It began as an interactive art project: 3,000 self-addressed blank postcards, distributed to strangers, in the hope they'd share their secrets. PostSecret surprised even its creator, becoming a sold-out art exhibit, a best-selling book and a seamless integration of the Internet and the mailbox. Artist Frank Warren joins Kojo to discuss how art and anonymity combined to yield fascinating insights into human behavior.