Online peer-to-peer marketplaces allow users to share everything from cars, apartments and parking spots to kids' clothes, fruit and even leftovers. These websites are part of a booming "share economy" that is changing the way participants think about ownership and community. We talk with the founders of some share sites. What have you shared, and what are you willing to share?

Guests:

Lisa Gansky , author of "The Mesh: Why the Future of Business is Sharing" and founder of Mesh Labs

Jessica Scorpio , co-founder of Getaround, a peer-to-peer car sharing company

Leah Busque , founder of TaskRabbit, a peer-to-peer errand service

Joe Zadeh , head of products and innovation for Airbnb, a global network of places to stay offered by locals