Jeff Ragsdale: The man who gave the world his number
12 July 2012 Last updated at 01:17 BST
When Jeff Ragsdale went through a difficult break-up last year, he found himself isolated and alone in New York City.
Desperate, he put his phone number on a flier along with a simple message: "If anyone wants to talk about anything, call me." He posted copies all across the city, and waited.
The response was overwhelming, with thousands of calls coming from across the US and around the world.
Jeff and two collaborators then transcribed the conversations, text messages and voice mails, publishing them in Jeff, One Lonely Guy.
Video produced for the BBC by Irina Khokhlova