BungeeBones is a peer-to-peer webdirectory/link exchange application designed to advertise websites and to earn Bitcoin at the same time. It is kind of like mining for Bitcoin with your website traffic. It is completely free and provides a complete (with categories, links AND management) web directory for your website. There is also an affiliate program if you don't have a website or don't want a web directory on it. The affiliate program is great to use in your FaceBook and Twitter accounts.
site link: http://bungeebones.com/