Did you know that there are over a billion bicycles on Earth, with around 100 million just in the United States? Sadly, not all of those are used daily, so there’s a lot of room to increase the usage of those bikes by getting unused bikes to the people who want to use them (either from individuals or bike rental shops). That’s what Spinlister, a young startup, wants to do. They want to make peer-to-peer bike rentals a reality in the same way that AirBnB facilitated P2P rentals in the real-estate world.